They have a couple TFA flavors that Bullcity, Riversupply, and Flavor Jungle don't carry, Boysenberry Deluxe and Pomegranate Deluxe are two that I know of. There may be a few more.

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Seems kind of like picking up random food from a grocery store because they don't have it at the one you normally go to, even though you have no idea what you're gonna make with it (or if you'll even like it)

Guessing you're already shopping there for the sale, though, so I get why you're asking. Outside of their "house" flavors and oneshots they actually carry a much more limited selection than somewhere like BCF. Not likely you're going to find any rare gems there.