while not exactly the same, I've been eyeing this one from Anthropologie:

http://www.anthropologie.com/anthro/catalog/productdetail.jsp?id=960010&navAction=jump&search=true&parentid=SEARCH_RESULTS

Looks like an overstock.com special that's been reupholstered. Try there.

Here is one on sale at UO http://www.urbanoutfitters.com/urban/catalog/productdetail.jsp?itemdescription=true&itemCount=60&startValue=61&selectedProductColor=&sortby=&id=15925225&parentid=A_FURN_FURNITURE&sortProperties= subCategoryPosition, product.marketingPriority,-product.startDate&navCount=36&navAction=poppushpush&color=&pushId=A_FURN_FURNITURE&popId=APARTMENT_FURNISH&prepushId=

Here is something similar from Target:
http://www.target.com/Window-Seat-Amber-Abundance/dp/B000TLTF6K/ref=sc_qi_detaillink?ie=UTF8&pf_rd_r=10E1EKY4TTRAGNK3417N&pf_rd_p=436115101&pf_rd_i=B000TLTF6K&pf_rd_s=right-1&pf_rd_m=A1VC38T7YXB528&pf_rd_t=5101

Third place in U.K.:
http://www.funkykidsfurniture.co.uk/p/666627/patchwork-print-storage-bench-seat.html

via:
http://www.freshdesignblog.com/2009/07/one-kimono-bench-three-prices/

Hi Chris,

I'm a furniture designer and make custom furniture for private clients, retail stores and interior designers. With your help selecting fabrics, I could have this bench made for you in any size. I love the red legs and I'm sure those would be hard to find anywhere else.

My main website is coming soon but you can see my collection for Little People at LPbigdesign.com

Contact me for more info. Tracy Steele Designs 646.337.3341

The bench in the picture is the children's storage "sofa" from Colorique, which is a Dutch company. Thus the prices are a bit better in the Netherlands than in the UK and many of the places seem to ship abroad. (Just google Colorique Kimono and you will find this and the other pieces that go with it.)

Also, the Colorique website tells you where their things are sold and there is a place in NY on that list. Who knows if they might have this...