I just bought a Campbell Hausfeld Greasegun at Tractor Supply,it is the air operated one.Looked at Sears first,they had 2 different ones.One for $50. and one for $32.I havent had much luck with sears tools lately so I got the one at Tractor Supply.$29.and guaranteed for 1 yr.If it fails I just return it to the store.Antone else have one of these?