I'd look up each part on digikey, find the price per unit in 100 qty for the cheapest variant and ask about 5 times that for a qty of 10 on eBay. Postage will add to the price for your customers, and eBay's fees will cut into your price. What is your time worth?
The hard part is finding someone who wants this stuff.
When I've bought collections of parts like this it's been for prices that are a couple of cents in the dollar of their retail price so I can justify the price even if I only end up using a very small fraction. Even then, they've not always been a good deal.