Where to get a bunch of different *individual* bottles of root beer?

Putting together a root beer "bouquet" for my husband.

World Market and Kroger have a couple brands available for individual sale.

Total Wine and Spec's seem to only sell in 4- or 6-packs.

I know Grapevine and Carrollton have some retro candy stores with many options available, but hoping to find something here in Fort Worth.

Any ideas? TIA