Amazon has the Neiko 32-Piece Extra Long Security Power Bit Set for $20 with free shipping. Includes uncommon bits that will loosen tamper-proof security bits that cannot be unscrewed by regular screwdrivers.
Has excellent Amazon Reviews.
Amazon has the Dremel 11-Piece EZ Lock Cutting Kit (EZ688-01) for $14.98 with free shipping on $25+ or with Prime. List price: $28. Kit includes 4 metal-cutting wheels. 3 thin-cut wheels, 3 plastic-cutting wheels, storage box. Has excellent Amazon Reviews.
Walmart has it for the same price.