SEM Vinyl Dye?

I went looking for vinyl dye tonight and everywhere i went all they had was this cheap looking stuff called vinyl paint, maybe its the same thing but it had no brand name. Is SEM Vinyl Dye the best way to go? I want this to look really good and im willing to pay extra for the better materials. Also where can i get this, besides pep boys which is 204 miles away from me, lol.
Thnx
I went to advance auto parets tongiht and autozone, no luck at ne of those!