I would still try to sign up to join pkmncollectors! Yeah its a pain in the butt to join but they can help you get eBay price references and ID your stuff with prices people are paying for the items. They helped me find out my ugly giant weird bulbasaur plush I own is a European rare mirage plush worth in between $100-$200! I promise its worth it to apply there! Theres always collectors that collect all items of certain pokemon that would snatch up your older merchandise in a heartbeat!
I'm princess_hakuryu on there! I have an absolute blast talking to people there from all over the world!