Some quick searches for "[brand] linear polarizer" returns some pretty bland results. Each brand generally has just one linear polarizer. Some offer multi-coated ones, while others offer them in a glass variant. Tiffen offered some "warm" versions (linear polarization seems to cool light, in contrast with circular polarization, which may warm, cool, or tint light depending on orientation an coating), B+W and Heliopan offer "Kaeseman", or a fully "encased", filters that are edge sealed (might be useful to guarantee full weather sealing on lenses+bodies that support weather sealing), etc.
They seem to come in three general price ranges: Around $20, around $60-80, and $120-$160. Between all the price ranges, the $60-80 range seems to be the best deal, as they seem to be multi-coated glass linear polarizers. The really expensive ones don't really seem to have anything particularly compelling outside of fancy terms like "Kaeseman edge-sealed" or "slim edge mount" and whatnot.
From what I can tell, a glass, multi-coated, linear polarizer is a very simple optical device, and there are generally one or two lines from each filter maker: the basic version, and the "uber" version that is super thin, kaeseman sealed, better-multi-coated, etc.