I'm interested in selling a large collection of Rock 33 LP's. I was wondering if anyone has any idea how to find out the value of some of them. I know I want to sell 8 Rolling Stones albums first, Harlem Shuffle, Tattoo You, Dirty Work, Under Cover, Emotional Rescue, Get Yer Ya-Ya's Out & the double set, Rolling Stones Hot Rocks 1964-1971. I perused some of them & they all appear to be in very good condition. If anyone knows where I can find such info, please let me know.