I stopped by the welding place today in order to fill up my 5lb bottle and decided to take an empty 20lb with me as well. I just did the exchange today so the co2 hasn't been used....the cap is still on it and receipt is below in the pictures. The tank is heavy when it's filled....I would say it's about 50lbs if not more. A 20lb tank should last you a very long time so you won't have to keep running to the store in order to fill up the bottle. The hydro test was done on 4/09
Price: $105 for the filled 20lb tank.
Pickup in Greenwich CT.