Hey Derek,
Even though we're in the US, practically all the tools available at Home Depot, Lowes, and Sears are available in both metric and imperial, unless in your area things are different from where I am. For about $10, those stores should have a 5-piece torx driver set, with sizes T10, T15, T20, T25, and T30. Practically all B&O items use the T10 and T15 drivers. Here's an example of the Lowes set:
http://www.lowes.com/lowes/lkn?action=productDetail&productId=159650-930-324TX5C&lpage=none
Austin