It seems like items from popular culture are taking off lately on Ebay. This little M&M guy called Redbert Einstein was something I had never seen before so I picked him up while out thrift shopping. He just sold today for $63.50!
There are a lot of M&M items out there. Look for the dispensers, umbrellas , kites and other rare items you don't see every day. In general you never want to pay too much for items you buy at thrift shops, tag sales etc. Stay in the 3 buck and under range.