Yep! My favorites are by Artifex Wax and Papier Plume. Artifex seems to be moving their store to Shopify right now, and the url is odd, but google will find them.
(Just don’t buy hard wax if you’re intending to mail it.)
Papier Plume | Fountain Pens, Unique Inks, Wax Seals, Leather Journals
Papier Plume is your source for stylish and luxury Fountain Pens, Calligraphy, Bespoke Inks, Wax & Seals, Leather Journals and fine European Stationery. We're located online or come visit our store on...