Thousandshores Inc via Amazon has Dr.meter DB-01 Dr.Meter Diamond Drill Bits, Silver (Pack of 12) for $9.00 with free shipping. You can save $5.99 with the code JPI9S52H at checkout.

Features include:

• This 12 pieces drill bit set bores circles in ceramic, glass, granite, tile, slate and more in seconds
• Each drill bit comes with a shank that holds the bit in place without slipping
• The premium steel is double-tempered for increased hardness. They can cut through a wide variety of materials with little to no resistance