I intend to make an offer for a box of MSX1 games (cassettes and cartridges) and an SVI-728 (so far w/o AC adaptor) to a friend's friend.
How can I decide what amounts to a reasonable offer in terms of what they'd get on other forums like auction sites? Look up sales on eBay or whichever for each game separately or is there something else I should note? I've never done retro purchases before or used auction sites.
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. If the seller isn’t interested in investing quite a bit of time and research into auctioning all of them on eBay to maximise profit, I would just go by “reasonable prices” plus a nice friends set buy discount.