RE: Trigger tension
Backtensions are great releases but you DEFINATELY need to find someone who knows what they are doing when you start shooting it, to help instruct you. I'm constructing a thread as we speak on a crash course to back tension. Keep an eye out for it in the bowhunting section.
EDIT:I didn't answer your question thefirst time around. I would personally check archerytalk and try to pick up a used one there.