Dunno.... I'm not sure 'bout where you are, but here in Florida, I've actually spotted a couple restaurants that have the fountain system that still use the old corney kegs (I work doing commercial refrigeration.... so I get to see things in the back). I guess the soda companies still use them to some extent, although probably not as much as the old days. More beer has free shipping on items over 59 dollars. I just ordered some supplies and added a corney 'cause I needed to bump up the order to clear 59 bucks. I'll probably be looking at gettin' a couple more, so next order of supplies, grab another. Depending on how many you are lookin' to get, may be your best option is to order them from there.
Allan