Depends on your idea of a 'good deal'
I guess you are looking for something in the used market? If so, then you can find pretty good deals on e-bay, craigslist and the various marine want-ads you can find online, but it might take a while before you find a really good deal. And keep in mind that regardless of what you find, chances are it will not be setup for your boat, so you will still need to tweak it to fit right. To that end, keep an eye out for a trailer that has adjustable bunks, axle(s) and winch support posts so you can adjust the balance of the boat on the trailer. If they are not adjustable, then be prepared to cut/weld (or paying someone to cut/weld) to get it to fit. Also, it will be easier to fit if the trailer was previously used for a sailboat.. motorboat trailers are setup for a much further rearward center of gravity. Something to think about.
Cheers,
Brad