I have only seen this at Ikea. I think?
Even if you find it in another color; remember you can always paint it white!Did you check out Crate and Barrel?
West Elm has/had a parsons desk...not sure if its still available but worth a check..
Ikea used to have the long white one, but now only carries it in wood finishes. I've never painted an ikea piece, so I could always give it a shot. The west elm desk in nice, but too small. It just looks so cool!
West Elm. Also Wal-Mart has a mini version for pretty cheap.
CB2 has a a very similar piece called the runway console in white! It is a bit shorter and narrower, and it doesn't have drawers. I recently purchased a new Ikea desk that has a similar look. You can check it out on my blog under "Bright White: New Home office on a budget". Hope this helps!
Thanks for reading. What do you think?