I got a used boat trailer made of galvanized steel (rust proof), and for $250, I was able to get a friend to frame it out square (he did the welding, I did everything else including grinding, painting, etc.) with c-channel steel, and then put down a new deck of 1x2x8 pressure treated boards plus added tie downs and two used pingel wheel chocks. It rocks!!
I also re-wired it with a kit for $29 from Walmart. I've had people offer me over $800 for it already. In trailer costs and materials I think I spent no more than $600.00. Do a tiny bit of work yourself and save a lot - and have a quality trailer to boot.
I am able to pull it with two dirt bikes or one Ducati on my 2005 Honda Civic Si; it has less than 100# tongue weight fully loaded and my hitch can handle up to 200# tongue weight max.