How much do you have to spend to get a decent grease gun? I bought a cheap "lever action" one a long time ago, but the thing seems always to be either not working right or leaking on me, plus the lever is annoying because you need two hands to pump it. I went looking for a pistol grip style and the one I found was $40. Seems kinda steep. Is that just how it is? I've also been thinking about the air powered ones, but I'm not sure if that's the right thing for someone with a fleet of only 4 vehicles. Any opinions?