Another option is a refurbishment of an old unit. I put a post on the old forum with information on a couple of companies. As I recall, you'd be looking at $75-$150. I bought an old unit from another forum member and installed it, so I have a spare that I know needs refurbishment. The one I got doesn't seem to work quite right, so I'm planning to send in my old broken one, get it refurbished, and reinstall it. You're more than welcome to the one that's in my tank right now after I'm done (all I ask is that you send me funds for shipping). Or maybe somebody else has one they can part with...
-Drew0569
formerly Mustangfan0569