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Amazon [amazon.com] has 5-Pk Bosch 2″ Torx #20 Impact Tough Power Bits for $3.83. Shipping is free w/ Prime or on $35+.

Toolup [toolup.com] has 5-Pack Bosch 2″ Torx #20 Impact Tough Screwdriving Power Bits (ITT20205) for $3.83. Shipping is free on orders $199+.