I would just have one made at a frame shop.

You can get the exact kind of frame that you want, and it shouldn't cost that much to add mirror to it, instead of glass.

Every frame shop on the Upper East Side has these and usually a couple of them on sale. If you're looking for a wood frame, Bombay company is currently having a sale. I believe the store on 87th and Third has had one (priced at $199 maybe?) in the window for some time.

Horchow hase some VERY ornate ones, go to their website and search "floor mirror"

Or the idea of having one made at a frame shop is good, it might be cheaper...

I have had great luck finding large floor mirrors at TJ Maxx/ Homegoods!

that area on houston (forgot cross street) seems to have some very pretty, very large mirrors.

Have you considered brocade home?

http://www.brocadehome.com/bh/catalog/category/category_w_products.jsp?link=leftnav&navAction=push&navCount=1&categoryId=bh_cat101001

I know Room and Board will make several of their mirrors in whatever size you like but I'm not sure what their maximum sizes are.

If you are down with vintagey stuff and are in NYC, I'd suggest checking out Junk in Williamsburg (on Driggs & 9th). They have lots of mirrors there. You'll have to go through the piles, but you may find a gem for cheap.

Ross often has some nice big mirrors at great prices.

I had mine made at a framing store. Its 7 feet by 5 1/2 feet. It is not the cheapest way to go, but it is a solution if you need something very specific that you can't find elsewhere. The mass produced large floor mirrors can be $500 or less if purchased at a Crate and Barrel or Z Galerie but a custom mirror of the same size will probably run you another $1000 depending on the frame. One money saving note: you may be able to buy the mirror portion from a glass supplier and have it delivered to the framer and save yourself the frame store's markup (substantial) on the glass portion of the project. Also, there are different grades and thicknesses of mirror - you want to make sure yours is appropriate for a large scale mirror - thinner mirrors will crack easily.

check out this link from ballard designs

http://www.ballarddesigns.com/shopping/search/searchresultsmain.jsp?fresh=1&searchType=advanced&iMainCat=0&iSubCat=0&attribute14=0&attribute15=0&attribute16=0&RS=1&keyword=floor mirror&sort=0

check out the guy on houston and 1st with all the stuff on the street (again if your in nyc) he usually has tons of tin plated and painted ones. (cingular used them in the ads for the rokr phone when it came out)

Pier 1:

http://www.pier1.com/catalog/productdetail.aspx?oid=119513&returnURL=http%3a%2f%2fwww.pier1.com%2fcatalog%2fcollections.aspx%3ffh_view_size%3d8%26fh_eds%3d%25u00df%26fh_view%3dlister%26fh_refpath%3dfacet_59434054%26fh_location%3d%2f%2fpier1direct%2fen_US%2fcategories%3c%7b110304%7d%2fcategories%3c%7b110379%7d%26fh_start_index%3d16&fh_view_size=8&fh_eds=%u00df&fh_view=lister&fh_refpath=facet_59434054&fh_location=//pier1direct/en_US/categories%3C{110304}/categories%3C{110379}&fh_start_index=16

http://www.pier1.com/catalog/productdetail.aspx?oid=124452&returnURL=http%3a%2f%2fwww.pier1.com%2fcatalog%2fcollections.aspx%3ffh_view_size%3d8%26fh_eds%3d%25u00df%26fh_view%3dlister%26fh_refpath%3dfacet_59434054%26fh_location%3d%2f%2fpier1direct%2fen_US%2fcategories%3c%7b110304%7d%2fcategories%3c%7b110379%7d%26fh_start_index%3d16&fh_view_size=8&fh_eds=%u00df&fh_view=lister&fh_refpath=facet_59434054&fh_location=//pier1direct/en_US/categories%3C{110304}/categories%3C{110379}&fh_start_index=16

http://www.pier1.com/catalog/productdetail.aspx?oid=124589&returnURL=http%3a%2f%2fwww.pier1.com%2fcatalog%2fcollections.aspx%3ffh_view_size%3d8%26fh_eds%3d%25u00df%26fh_view%3dlister%26fh_refpath%3dfacet_59434054%26fh_location%3d%2f%2fpier1direct%2fen_US%2fcategories%3c%7b110304%7d%2fcategories%3c%7b110379%7d%26fh_start_index%3d24&fh_view_size=8&fh_eds=%u00df&fh_view=lister&fh_refpath=facet_59434054&fh_location=//pier1direct/en_US/categories%3C{110304}/categories%3C{110379}&fh_start_index=24

I'm a fan of the old huge $99 Ikea Hovet mirror. No longer available at Ikea but they turn up regularly on CL for about $50. It is super minimal though with just a thin aluminum frame. Still quite a bargain.

http://www.ballarddesigns.com/jump.jsp?itemID=3006&itemType=PRODUCT&path=1%2C2%2C9%2C72%2C330&iProductID=3006

You might want to check out the flea market every sunday on Columbus between 77th and 78th. There's a couple of guys there that make different size mirrors, including large ones (roughly equal to the dimensions you are looking for). I believe that the frames of the mirrors consist of ceiling tiles they salvage from old buildings. The mirrors have lots of character and you can get a large mirror (7 feet by 4 feet) for less than $1,000.

The Four Seasons in Washington DC or Arlington, VA (don't remember) were remodeling and held a sale of all their old room stuff. I picked up 5 6 1/2ft mirrors. They are each heavy as all get out but they are already framed and gently used. They were $15 each. You might want to check to see if any upscale hotels in your area are doing remodeling.

the Seguro Mirror from crate and barrel has a lot of character. it is made from reclaimed wood and is priced at $699.

ikea has the mongstad for $150.

bo concept has a mirror for $599 and it comes in 3 different shades of veneer. it is 79" high by 46" wide.

This is 43" by 31" at Pier1 Kids:

http://www.pier1.com/catalog/productdetail.aspx?oid=3168&returnURL=http%3a%2f%2fwww.pier1.com%2fcatalog%2fcollections.aspx%3ffh_location%3d%2f%2fpier1kids%2fen_US%2fcategories%3c%7b2619%7d%2fcategories%3c%7b2623%7d%26fh_refpath%3dfacet_89564187%26fh_start_index%3d0%26fh_view_size%3d8%26fh_view%3dlister&fh_location=//pier1kids/en_US/categories%3C{2619}/categories%3C{2623}&fh_refpath=facet_89564187&fh_start_index=0&fh_view_size=8&fh_view=lister

Related question, how do you secure a floor mirror to prevent it from slipping without screwing it to the wall ?