I have a Kegco 542 (Beverage Factory) chrome dual-gauge regulator I'm looking to sell. I bought a new regulator b/c I kept getting a slow leak I couldn't pin down but it turned out it wasn't the regulator at all and it was this stupid
leak stopper thing that the place I get my tank filled installed. The only thing I didn't like about the Kegco regulator is that the adjustment knob can be kind of stiff. I'll part with it for $20 plus shipping, which I'm guessing will be under $10, but I'm not sure off the top of my head.
http://www.beveragefactory.com/draftbeer/regulator/double/premium_double_gauge_542.html