CVS has a deal where you earn $5 gift certificates for every two Rolaids or Listerine PocketPacks a customer buys. These items cost about 99 cent each, meaning a profit of $3 per transaction. The deal is unlimited. After a two day wait, you can repeat the process, using the certificates from before to buy the new Rolaids and Listerine, repeat, repeat.
By August 4, 2006