I've been out of the trading game for a while so I was/am low on trading pins. I found that it depends on what KIND of traders you want, if you just want pins you can trade in the parks with cast members, then the mystery packs are great, or hitting a boxlunch or hot topic. If you want more desired authentic traders I suggest going to a reputable pin seller on something like whatnot or a facebook pin group. There are a lot of great sellers who have like $1-$5 starts and you can get quite a number of authentic pins in those shows. ABSOLUTELY stay away from bulk lots on ebay as they are almost 90% scrappers. It's great that you're trying to expand mindfully, welcome to a fantastic hobby!