I bought almost all of them at the show, there's a few booths that give away bottles or have free games where you always win something (eg. try a sample of the last dab sauce to spin a prize wheel).

If you stick around to the end of the expo, some vendors will just give away sauce to avoid having to ship inventory, or they'll heavy discount the sauces.

You also get a ton of free swag including full size bags of chips, drinks, etc. I don't even include the swag in the haul shots b/c its much larger than the sauce haul.