There are some UV resins that are more expensive than other, but some are quite affordable. For now, I'm pretty happy with Bug Bond despite the higher price. It works good compared to the other stuff I've tried. I like the applicator and the container it comes in. There have been discussions not long ago in the General Tying Forum that might be of interest to you.
clear cure vs bug bond vs all the other stuff
Question on UV fly finish
In one of those threads there is mention of Solarez which seemed to be pretty affordable and might be something I try in the near future based on the price.
UV Cure Head Cement-Hook & Hackle