They sell so many different cases for you o store and display your hockey pucks. It all depends on how many pucks you want to store, how big of an area you have to display, and what your budget is.
so this part can be tricky, if you have 10 puckd I would buy a case that can fit 15, so I would get 5 more spaces than you actually need. I mean, you're going to get more pucks so you'll need a new case eventually, but for the time being get 5 more spaces than you need.
Figure out where you are going to display your pucks, if it's going on a shelf you might want something small. If you're hanging it on a wall, maybe you want a big display case. It all depends on the size of your space.
So... obviously you don't want to spend to much on a display case, but maybe you want to buy one. If you buy a display case it will look nicer,and have a nicer paint job/design. However, if you don't want to pay to display your puck you can make a DIY case with some wood nails and plastic or plexiglass. Whatever you choose I'm sure your pucks will look amazing wherever they are.