My favorite band, Parkway Drive, also has my favorite merch. I'm still waiting to get order some shirts, windbreakers, crewnecks, and even a scarf if i wanted one. Bands have been getting the big records this past year, and Parkway Drive has them in gold, black, or blue. They have a book if you wanted to learn even more about them.
This a crewneck i really like.
I like the more simpler shirts with the logo writing, and that's a lot of what Parkway Drive has to offer. It's easy to find there merch because you can just go to their website, other bands you have to search around to different websites, and hope they have what you want.