No offense to uncle Bob, but in my opinion, this is one of the major problems with Sears tools — by contracting with manufacturer du jour, you can be left high and dry in the replacement parts department. Sears contracts with XYZ manufacturer to make a tool for them, which they do for a few years. Then Sears moves on to manufacturer ABC. Manufacturer XYZ has no reason to make any more of anything.
I know I can still find parts for my 25 year old Bosch tools.
The other reason is that Craftsman power tools rarely have the quality as the traditional professional-quality brands. Price may be a more important consideration than other features.