Do you have ability to re-fill propane tanks?

Yes

Yes they charge by the gallon. They also price match on their tanks. I wanted a 40 pound tank and found one at Ace hardware in Rockwall for $79 TSC is $89 I told the manager and he knocked off $10

Yes they do, and a helpful staff.

Yes, best price in area. Also sells tanks, heaters, hoses, and propane supplies.