Updated April 13th, 2020.
1Password password manager now 50% off
1Password is the best password manager you can buy and now it’s 50% off at the Mac App Store. It keeps track of all of your passwords and supplies them when needed. Synchronizes with your iPhone and iPad too. Take my word for it: you want this.For more
UPDATE: the sale is over. However, you can buy 1Password directly from AgileBits.com and save 20% with coupon code “MacPowerUsers”.