Many streamers get their cases from sponsorships, but if you buy them yourself, there are a few solid options. Steam is the easiest and safest, but third-party marketplaces like SkinPort or DMarket are great alternatives if you want to save money. Some YouTubers also buy cases in bulk from Buff.163, as it offers the best prices, but you need to be comfortable using a site with a more complex transaction system. Just be careful with any 'sponsored' case-opening sites—some are rigged and untrustworthy.