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Amazon [amazon.com] has 10-Pc Bosch Impact Tough 2″ Square #1 Power Bits for $5.51.
Shipping is free with Prime or on $35+ orders.

Toolup [toolup.com] has 10-Pc Bosch Impact Tough 2″ Square #1 Power Bits (ITSQ12B) for $5.51. Shipping is free on orders $199+.