I haven’t used them in a while, but I used to go to Calgary Computer Wholesale

My city has a couple mom-and-pop type businesses doing it, I’d hazard a guess it’s similar elsewhere - never heard of any ‘big name’ outfits doing it on any real scale.

Tribes Ascend was amazing; I think it might have been towards the end of the game’s popularity, but I loved that they sold a pack to skip the F2P grind progression entirely (kinda like getting a GOTY version a couple years later)