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That would be a good price, IMO. New Starline brass is at least $0.20 each, so OP can use that as a guide as well. Typically once fired brass is worth half what new costs, but with a less common calibre like 10mm Auto I would be willing to go a bit higher if necessary.
Interesting, I tried buying some 10mm brass from Western but they wanted more than the price of new Winchester which was twice the price of Starline. I made him aware but he wouldn't budge on the price since he didn't see much of it come in the big barrels of range scrap he buys. Only time I have bothered with that outfit. Seeing his prices through the years I never missed much... Necro threads are fun.