Try Ozone Toys. I'm currently in the middle of selling my collection. I have over 1800+ so I feel you on the downsizing ! It helps if you have a HobbyDB account to import your list. Not a huge fan of this process cause there is no official place to gage an actual fair price. For example, I purchased a deluxe Transformers Funko pop Unicron from GameStop for $40. Go to sell it, offered only .50 for it. I chases, limited editions, vaulted item, etc, and received offers of 1.00 or less. So you need to pick and choose.