$4.64: 4-Piece NEIKO Impact Socket Adapter and Magnetic Bit Holder Set (1/4-Inch Hex Shank with 1/4, 3/8, 1/2-Inch Drives) at Amazon

4-Piece NEIKO Impact Socket Adapter and Magnetic Bit Holder Set (1/4-Inch Hex Shank with 1/4, 3/8, 1/2-Inch Drives) at Amazon. Price: $4.64, 47% lower than the list price of $8.78. $2.53 lower than the previous price of $7.17. Shipping is free with Prime or on $35+ orders.