Simple answer:
Not many hobbyist have the kind of cash to buy that many at one time. The only people that could reasonably afford to buy would be a retailer or well established flipper. So you are gonna need to discount the collection by a good amount.
Dollar for dollar your best bet would be to start selling them off one at a time. You can list at prices you want and just keep them advertised until they sell or closer to moving date and then try to sell whats left as a group.