I just got my first grill, I picked up a Weber due to all the high recommendations here. The model is a Genesis Gold C. Anyway I never had a gas grill before and don't know these things so where is the best and cheapest place to get a propane tank filled?
Most hardware stores will fill your tank for $15-$20.
Ouch. Try a local gas station. You can tell which stations refill propane because they'll have a huge propane cylinder sitting outside. I usually pay $7-$10.
go to a gas station/truck/rv stop, they'll have a big propane pig out front. I paid 7.xx in ND for a top off at one place in town that was open late. Most gas stations are only staffed for fills until like 6 or 7 around there.