Did you realize there were twenty-six different sets, dating back to 1953. It all started with Howdy Doody and has gone on to include Davy Crockett, the Flintstones, Archie, Warner Bros, Dr. Suess to Peanuts in 2001. Chase mentioned there are a lot of variations in these glasses, e.g. different impressed bottoms and different colors that were used. It would take a lot of diligence (and probably impossible) to track down a complete set of Welch's glasses that included all the variations! He said one promotion that is getting hard to find is the Dr. Suess series, a set of six from 1996.
Most of the Welch's glasses are very affordable. They appeal to both glass collectors and cross-collectors, e.g. Peanuts collectors.