Does walmart fill co2 tanks

To the best of my knowledge, WM does not sell CO2. Acadamy does in the Dallas area and so do most paintball stores. But just for a heads up, a lot of stores are going away from CO2. It has become a commodity that is more exspensive than for N2 or compressed air. The stores are charging less for HPA than for CO2. You can get a 48ci 3000 psi tank for less than $90 in most cases.