I'd be careful using book values of chips. As the authors have pointed out, they are just guides using the available information at the time of printing. Like Gene noted, how many does the seller really have? Has his small hold of these chips been taken into consideration with regard to the prices? The reason I don't like obsoletes that aren't from AC is that they might turn up in large amounts at any time. Just food for thought. You don't have to eat it.

BriaN