Lowe's offers the Kobalt Interchangeable Drive 46-Piece Standard and Metric Mechanic's Tool Set for $14.98. Opt for in-store pickup to avoid the $5.99 shipping charge. That's $25 off list and the lowest price we could find. It includes 18 spline sockets, a ratchet handle, three extensions, three drive adapters, a hex bit adapter, and 20 assorted hex bits.