Craftsman 43282 4-Piece 3/8" Drive Extension Bar Set for $8.99.  Order online for in-store pickup at Sears to lock in the price, ensure availability, and save on shipping.  Otherwise, shipping is $6.50 for a total of $15.49 shipped.  Here is a screenshot for your reference. The set includes a 1.5", 3", 6" and 10" extensions.