Ran into some cheap Wilsonart laminates on CL the other day. The guy has a couple of 4x8 sheets of 1570, which looks really similar to Designer White, but he did not have any Designer White available. He's in Auburn WA.

http://seattle.craigslist.org/skc/mat/872139678.html

http://samples.wilsonartcontract.com/c-81-white.aspx

I'd buy them myself but I need a longer sheet and I really want to try paints & pearls