That's just how I did it. When I had price lists in hand, it made it much easier to talk to the store owners. The only trouble is varying weights for things like finger cards. Some places I go have had me switch to by the pound and I bring my own scales. It's not too bad really when they have everything in Rubbermaid totes. I just bought 124 lbs of motherboards that way today.

Other places like a by the piece pricing, so I have it both ways. Desktop hard drives are easy to count and they like to see the 50 cents each stack up. (fortunately, my 50 cents per pound works out almost exactly the same).

Then there are the best places for me. They start off selling what they can, then get overworked, need space, tired of sorting, and just call me to get rid of this junk today. Nice. I do haul off everything they want to get rid of, not just the best stuff. That keeps them happy.