Thousandshores via Amazon offers Prime members the Dr.meter 12-Piece Diamond Drill Bit Set for $13.99. Coupon code "Z29GRY6I" cuts it to $11.99. With free shipping, that's $2 off list and the lowest price we could find, although we saw it for a buck less in January. These diamond dust-edged drill bits come in 12 sizes, ranging from 4mm to 50mm, and are designed for cutting tile, glass, counter tops, and more. Deal ends May 25.