Ok, and which 3/8 drive impact do most of them use? Snap on MG31, MG325 or IR 2115ti, or 2112? If you're interning watch and learn from the other techs to see what works for them, holds up the best, and what they like. Good deals aren't always good deals. The price is only one part of the equation. You also need to have speed, power and durability. If you only buy something because it's cheap, you'll end up being unhappy with it. I still wouldn't recommend getting a 3/8 impact until you have a decent 1/2 drive impact.

For me, I prefer the IR 2115timax series. It's light, powerful, and compact.