On sideline swap, sort by the size you need, and just take time browsing. There’s a ton of good pants from college, juniors, and minors teams that are less expensive than ones with NHL branding. It takes some time to learn about what different codes mean, but you’ll good about yourself once you start to learn some of the codes and are able to visually identify stuff. Patience and paying attention are your friends.
Resources are out there, but a lot of it is piecing together different info from different places.