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Amazon [amazon.com] has Bosch ITSQ12B 10 pc. Impact Tough 2 In. Square #1 Power Bits for $5.51. Shipping is free w/ Prime or on $35+.

Product Description from Amazon:[list][*]10X LIFE OVER STANDARD IMPACT BITS[*]XTENDED TORSION ZONE HELPS TO ABSORB HIGH-TORQUE OF NEW IMPACT DRIVERS[*]PRECISION-ENGINEERED TIPS FOR A TIGHTER FIT AND LESS CAM OUT[*]HEAT-TREATED MANUFACTURING FOR STRONGER BIT