Aye, there are loads. Lived there for 10+ years and go back once a month.
Go to rue victor massé in the 9th. There are many side streets and parallel streets off that street with music shops.
Rue victor massé is one long street of specialist music shops, at least 2 bass guitar dedicated ones, others dedicated for pedals, left hand only, vintage, acoustic, and even pointy headstocks. Lots of small stores.
Much better than London (where I live now) imo