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Amazon [amazon.com] has 40-Pc. Klein Tools 33801 Impact Driver Bit Set w/ Magnetic Nut Drivers for $19.99.
Shipping is free with Prime or on $35+ orders.

Home Depot [homedepot.com] has 40-Piece Klein Tools 33801 Impact Driver Bit Set with Magnetic Nut Drivers on sale for $19.99. Shipping is free.