Starting on May 2 until May 10, $50 iTunes cards are only $40 at Canadian Walmart stores. Once loaded up on your account, you will be able to buy music, TV shows, movies and apps at the iTunes store. You can even use the credit to buy your favourite software at the Mac App store. Apparently, $25 iTunes cards are on sale at Rexall/Pharmaplus stores for $20. If you plan to make some Apple purchases in the near future you may want to take advantage of these great deals and stock up on those iTunes credits.
Source: iPhone in Canada