P.H.
You can sometimes get lucky at yard sales. I recently bought 5 VHS tapes at Other Mothers and threw away 3 because they were broke.
There's a big store on 19 Ave & Northern Next to Sprouts,that takes in trades for books, Video games (nintendo wii, etc) and they have tons of childrens video's and books.
I just went to BlockBuster Video and bought 4 ( Previously viewed)DVD'S for $20