Agile takes 50% off its 1Password password keeping software and Knox file-securing software, as listed below. Plus, get an extra 20% off via coupon code "MacPowerUsers". They're at least $8 off and at the lowest price we could find. The deals, with prices after coupon unless otherwise noted:

• 1Password for iPhone, iPod touch, and iPad for $8.99 (not eligible for extra 20% off)
• Knox for Mac for $13.99
• 1Password 3 for Mac from $19.99
• 1Password for Windows from $19.99
• 1Password for Mac + Windows Bundle from $27.99