If they're scrapbook magazines, then for layout ideas, inspiration, etc. i just got 46 back issues from *bay for $10. i only had 4 of the issues already. it was Creating Keepsakes, Memory Makers, Simple Scrapbooks, Scrapbooks, etc, and scrapbooking & beyond.
Old magazines are on our class supply list for the SmashBook class. They said we would look through them to cut out things we like, words or phrases, titles, etc. It could be food, fashion, neat scraprooms, vacation, etc.