You get what you pay for... Key Sailing uses a local trailer manufacturer. Even their galvanized Wave trailers are $800 right now. The Trailex line is the best I've seen at regattas... I expect I'll bite down and pay the price someday soon because I'm travelling more. Right now I'm using an old Hobie 16 trailer that I picked up cheap and worked on - that'll do you fine if you don't travel too much. There's plenty of them out there, even if you have to buy the scrap boat that sits on it. I almost bought a rotting Sol Cat for that reason.

Good luck - post pics of whatever you find...