a CCR poster???

Hi, okay, I'm 17, and I'm in the proccess of trying to find and get old classic rock posters, like that of Pink Floyd, Led Zeppelin, Jimi Hendrix, and CCR, but, I haven't had much luck finding any posters at all. I'm wondering if anyone knows a store where it has nothing but old band stuff, and posters, becasue it'd really be cool to have a ccr poster, yet i can't find one. If anyone does know any main brand stores, let me know please, and no online stores, I dont online shop...