Fun New to modern tcg


Aspiring Trainer
Good day everyone. Recently my nephew and i have gotten into tcg. I was wondering if there is anwhere i can get some older card packs from legit people? My nephew has started doing youtube videos of openings and i think having some slightly older stuff to open as well would be fun

If anyone wants to check out his videos on youtube look up Grinn :) constructive feedback is always welcome.