I use the Lincoln pistol grip guns that are around thirty bucks on amazon. They work fine for me and are cheap enough. I have a lot of things to grease and never thought pumping it by hand was that hard. Never saw the need to spend $200 on a battery one and I think I prefer manual because I don't have to worry about charging it. I have a harbor freight air operated one and it works fine but I usually just grab the manual one instead of dragging out the air hose.