Gambling with any used one. But saying that I've been very lucky with the used ones if you can find one anymore. Best bet and I know you said bucks were important, save a few and give our "Dingy" (member here) a shout. He sells a replacement for these things that cures all the woes he claims. I have two of them and still haven't hooked one up to try it.... I've been lucky enough to keep the original ones going.