Walmart has the Workpro 145-Piece Mechanic's Tool Set 1/4" & 3/8" Drive Sockets Set (W003046) for $40 with free shipping. List price: $67. The set includes chrome vanadium steel sockets and screwdriver bits crafted from S2 steel.
Amazon has the Craftsman Door Lock Installation Hole Saw Kit (CMAH1MDL) for $19 with free shipping on $25+ or with Prime. List price: $22. For use on both wood and metal doors. Features adjustable for both 2-3/8" and 2-3/4" backsets, metal or wood doors, self centering jig fits all common door widths. Self Centering Jig fits all common door widths.
Amazon has the GOXAWEE G4007 Rotary Tool Kit w/ 140 Accessories for $40 - 10% off coupon (Clip extra savings coupon) - $10 off with coupon S7AMQI47 (Ends 4/3) = $26 with free shipping. Features 5 speeds, a keyless chuck, flexible shaft, various 1/64" to 1/8" shanks and accessories for drilling, cutting, sanding, and more.
Has good Amazon Reviews.