Where to Start collecting mix and match figures?

Hey everyone, As a kid I used to have so many of these little guys, and a few years back I had to get rid of basically all of my childhood toys. As an adult with adult money now though I want to get back part of my childhood and thought I’d start with these little penguin guys I loved to play with growing up. Does any know where to start collecting them other than eBay? Are there any good resources for collecting old club penguin merch? If there’s specific figures I’m looking for what would be the best way to track them down? Thank you for your time!