Another place to check: your soda distributor. I'm sure they'd be very interested in finding a way for you to dispense more of their product. Might be free, too (or, at least, cheaper than a supply house).
Thank you for your replies Kimmie and Greg. I will try the google.com and see where is leads. I tried pepsico first with no luck so that is why I'm searching. Thanks again for the help.