Baseball card prices are the highest they've been since 2008. I've made four different indexes which track postwar card values: one for Mantle cards, one for Mays cards, one for Aaron cards and one for a broader range of hall of famers from the 50s and 60s. There are some neat looking graphs on my website!
http://www.vintagebaseballplus.com/indexes.html
http://www.vintagebaseballplus.com/indexes.html