Buckeye BrewCraft in Westerville now does REFILLS as well as swaps on 2.5,5,10, and 20lb CO2 tanks! No difference in prices for refills or exchanges. They also do beer gas (exchanges).
Buckeye BrewCraft does exchanges on 5, 10, and 20 lb tanks in certification or not. There is a $25 re certification fee. Prices are comparable to anyone else.... $13.50,16.00, and 21.00 respectively. Open 10-7 daily, 12-5 Sunday