I have made a few calls to the Coca Cola distributors (company owned) in my area and they either are not willing to talk to you or will only sell to you if you want to buy a minimum of 25 cases. I did find the one remaining independent Coca Cola distributor in my state and they will sell direct; however, they are about a 6 hour drive from me. I stop in and buy the 8 oz. glass bottles when I am in their area but that is only a couple of times a year.
Johnie and Kilroy are correct! Being that your machine is a can machine, Sam's Club or Costco will be your best bet although Costco has yet to resolve their issue with Coke!
The discount warehouses typically sell in cases of 32 rather than 24. Although, I would also watch the sale ads at the local grocer and Target as they often have deals at $5.00 for a 24 pack. At my local Costco, a 32 pack of Pepsi product costs around $8.00 or $0.25 a can. You should be able to pay for a new coin mech and the entire machine pretty quickly it at $0.50 a can and that will still be a lot cheaper than anywhere else. If you have a can deposit in your area, make sure to add that to the price!
Tim