This is a handy little Torx bit set for only $10.44.  Its Wiha part number 79245. You get Torx insert bits in T7, T8, T9, T10, T15, T25, T27, T30 and T40, a quick release bit holder, and a Bits-Selector Storage case.  The Bits are CVM Steel for long lasting performance and the bit holder is magnetic and quick release.  The bits are held securely in place and the magnet keeps the bits from flying out when you release them.

Wiha retail price is $20.08.