There is a local guy and his wife that have most every old AC chip. When I went to their house to see them all I had was an old price guide. I knew that prices had come down a lot but I still offered him $300 for part of the collection. He turned me down since he thought they were worth more like $1000 and after I got home I looked on Ebay and found that what I wanted to buy would have only been worth about $200. I love Ebay also!