depends on what volum he has, but my usual is $4 to $5 perrcomp. or a 40 50 split in your favor to start, you have travel time and fuel expience. I go 60/50 if I have to. never reveal your sell contacts to him. there is a good chance he will ace you out.
It also seems computer shops and Geeks will tend to chery pick the computer parts.you might also try to point out the low price of tin and keep the cases to off set your travel and tool costs.
computer shops and repair people also tend to think backwards on the scrap value of a computer, thinkint the newer a computer is the more valuable when, infact the opposite is true.
my partner brought me a load of servers today. he was so proud of the big old IBM on top of the load because it was a P 3 and not a p 4 (huge gold content) in fact it had a chinese board and 2 slot processors. ggood luck.
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