Don't have a kid, lol. They drain your account.
But honestly, I've been doing it by selling off parts of my collection that I don't want or need anymore.
Back in the day, I'd hold on to ANY comics, games, or movies I got in my collection. Because pre-internet, it was a lot harder to come by things and I'd take what I can get.
But nowadays, there's the internet. So I can be a lot more picky about what I add to the collection. In the meantime, I can trim the fat off of that old stuff that I picked up that may not be the greatest.