The Container Store is a store that sells home organization stuff; IMO, it's an IKEA without furniture.

Their desk legs. See their examples on that page.

Other desk leg from Amazon.

As for the suggestion I made, check out some of the ideas here:

http://sasayuki.com/laminate-countertop-desk/laminate-countertop-desk-superb-diy-do-it-yourself-search/ (random website I found with a few 'countertop' desk examples) Note the example where they added a matching keyboard tray.

I mean, you really just need to find a suitable surface and then whatever you want that's the right height to use for legs. If you have the budget, you could even get a motorized sit/stand desk frame and attach whatever top to it you want.