You could try Don King @ Washco 308-236-2047.
He sells the old ExpressKey system now called QuickPay, not to be confused with Etowah Valley Equipment's QuickPay credit card system.
I have a old ExpressKey system that I installed in 2000. I use it mainly for billing business accounts. I do pretty well with it for truckers and livery service. I also have Etowah Valley's credit card system. If I were to do it again I would just have the CC.
Not sure why you would want the Key System. Getting a credit card system with fleet & gift cards is cheaper, easier and ties it all together. The Unitec Washpay system I have also gives me reports on everything.