Woot offers IRWIN SPEEDBOR Spade Wood Drill Bit Set, 5 Piece (88885) for $7.97 (reg. $19.99) free shipping with Amazon Prime. 

Product Description:
The improved SPEEDBOR Spade Bits now last 2X Longer* and cut 2X Faster*. Next-generation SPEEDBOR® Spade Bits feature a chamfered cutting edge for durability in cutting wood and optimized point tip that is wider and longer than previous IRWIN spade bits to minimize splintering and control speed. Patented Blue-GrooveTM cutting edge allows for a large cutting area for aggressive removal of wood chips and fast drilling.