I bought an Oday 23 in May 2008. It had a rickety old single axle trailer that I paid a mobile trailer mechanic $700 to fix. New springs, bearings, etc. I drove the boat 45 minutes to my "home" lake...Lake Monticello, SC, which is near Lake Murray. I've had it moored there ever since.
I looked for a replacement trailer a lot last summer. But the darn things are $3000 to $5000! I even have considered buying used Oday's who have trailers with them...they seem to sometimes be less!
Since the economy tanked and I own an advertising/web design agency...I stopped looking, just in case we lost any significant client base. (that hasn't happened...yet.)
My only suggestion is to do searches on craigslist. That seems to be the best place.
If you're interested in splitting the cost of a trailer...I could be open to that!
I picked up 2 jibs and spinnaker for $100 off craigslist earlier this year. Good deal. Good sails.
Kevin