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This might be of interest - especially if you can find these at your local Sears store on the Clearance rack. If you must order on line, you will have to pay for shipping - probably not all that bad for if you buy more than one. I was looking for 1/4'' spiral up-cut and found some for $9.97 on line. There was a good selection of bits on the clearance rack in our central Washington store.
-Don
-Don