Digikey will also sell tiny quantities.
I’d suggest getting a heap of 2-input gates and a smaller heap of flops, and go to town. I, too, got a smallish pile of gates when I was 13 years old, and had a fun time with them. You can build any logic function you like with a large pile of inverting gates (there’s a moderately famous computer built entirely out of 3-input NORs). If you get Ye Olde DIP Packaged logic, you can use them with breadboards and not have to worry about the joys of soldering and resoldering with your happy fun-time gate assortment.
Today’s trivia: my gates were in TO-series packages and ran on 3.6V. Bonus geek cred for anyone who knows which logic family that describes.