Some of my best finds have been in thrift stores. I got Earthbound and Little Samson at Salvation Army and Goodwill stores, both for $5 each. And I live in a small ass town in the middle of nowhere! Networking is your best bet when collecting anything. Stores that I frequent know what I'm looking for when I come in. Some even hold back items for me cause they know I'll at least be interested. Get friendly with thrift store employees and owners. You might even get discounts if you're a regular. It just takes time and luck. But, if enjoy the hunt just as much as playing the games as much as I do, it won't feel like a drag.