Re: finding a trailer
I was in this spot once with a 22' deck boat and it was a pain.
Quick story - the guy who sold me the boat "lost" the trailer, he bought the package new and had it delivered to the marina where they would put it in and pull it out every year and he would never use the boat, until I came along and scooped it up. "yeah I had a trailer but I'm not sure what the dealer did with it...they were storing it for me, I'll call over there and see if they can find it....."
My advice is to comb craigslist, search tempest will search all of the craigslist areas around you. Then get on the horn with marinas and used boat lots to see what they have around. If you do end up buying one new (which is what a lot of people end up doing) you will not see any of it back in resale.
For your second question, price: $500-$3000