Restorationhardware.com

now for 159.00 for a six high bookcase
http://www.homedecorators.com/P/Metro_Bookshelf_with_6_Tiers/

the foundary has some industrial reclaimed wood shelves, but seems bulky compared to the ones in the picture

http://www.cb2.com/family.aspx?c=118&f=5969

Try these, similar but with glass shelves...

Crate and Barrel and/or CB2 have some variations on these.

Ikea's Hyllis galvanized metal shelves ($14.99) are very similar to the ones pictured in the first photo... http://www.ikea.com/us/en/catalog/products/40103727

Restoration Hardware has those exact book cases.

where can I get those sofas? lovey.

Depending on your definition of "affordable", and how MUCH like the examples shown you want to go, you can usually find inexpensive metal storage shelves at Home Depot, Lowes and Costco. Generally not as stylish as these.

find that its best to go to industrial sources like cisco-eagle. pricing is generally cheaper than retail, but be careful with shipping expenses. http://www.cisco-eagle.com/catalog/c-380-shelving.aspx

where can I get those lights on top of the shelves in the bottom picture?

Thrift store or craigslist.

Here's one that is more chrome-y, maybe less industrial. I suppose you might be able to distress the finish? I like it as-is.

http://losangeles.craigslist.org/wst/fuo/2163443961.html

bongrande has an ever growing selection of vintage industrial pieces (at GIVE AWAY PRICES!!)!!! they metal shelving units in from time to time. check on http://bongrande.blogspot.com/

Certainly not what I would consider 'cheap', but Ballard Designs has some shelving pieces (The Sonoma Collection) similar to the second picture. The Sonoma Tower: http://www.ballarddesigns.com/sonoma-tower/furniture/bookcases/194283?isCrossSell=true

Walmart.

http://www.walmart.com/ip/Edsal-Manufacturing-Industrial-Steel-Shelving-5-Shelves-48w-x-18d-x-72h-Gray/14873507?findingMethod=rr

Wisteria also has industrial-style shelving pieces.

I love the slim etagere from Room and Board:

http://www.roomandboard.com/rnb/product/detail.do?productGroup=3200&catalog=filter&menuCatalog=room&menuSubcategory=201141

At Sears... or many other such stores.
http://www.sears.com/shc/s/search_10153_12605?keyword=metal+shelving

I have similar industrial bookshelves and end tables from Anthropologie. I love the look and the quality is wonderful. They are still available on Anthro's website (the Decker line). I know they are a little pricier than the other great suggestions above, but if it helps, I bought mine over a year ago, so perhaps that means the collection will be on sale sometime soon. Also, sometimes if you call and speak with their customer service directly, they will give you a discount on the furniture shipping prices (especially if you buy more than one item).

Lowes, Home Depot, or many other large hardwars stores have metal shelving. Just look for garage or outdoor shelving.

^^^SPAM^^^

Vivaterra and Sundance both sell metal-and-reclaimed-wood shelving, though they're not exactly affordable (depending on how you interpret it). Still, a good bookshelf lasts for a very long time.

You should draw up some plans and have a welder make them for you. Places like Restoration hardware show them with the welds still showing. If you wanted the same rustic finish you would also need someone to apply a patina.

http://www.restorationhardware.com/catalog/category/products.jsp?categoryId=cat1680014

To find a metal source near you google it. If you are near Providence I would call The Steel Yard:
http://www.thesteelyard.org/

good luck!

personally I love one with a metal ladder as well:
http://www.restorationhardware.com/catalog/product/product.jsp?productId=prod80359&categoryId=cat1680014

I sure you have sourced the shelves by now, that if you are in the market again, you can actually custom made metal rack shelves at: http://www.justshelfit.com/metal-shelving-racks-for-storage.html.

Simply provide the them with a detail plan and they will be able to make a shelving unit to your specifications.