Kobo has a store. It's decent, it won't have Kindle indies, and IMO it has fewer/worse sales, but it's not a big deal to me. They do have a subscription plan with unlimited access to certain books but it's not clear to me how good the catalog is.
You can also buy from third party stores, e.g. Weightless Books for sci-fi & fantasy, and just drag-and-drop the epub onto the Kobo.
