Cheapest place to buy Lexmark ink cartridge?

I live in Eastern Ontario, Canada, and would like to know where the cheapest place to buy ink for my Lexmark X1195 printer. It takes Colour(26 or 27) and black(16 or 26). I just had the colour refilled, but it didn%26#039;t work properly. What is the best store to buy ink for this printer?|||Most office supplies stores (i.e. Office Max) give discounts for empty cartridges. I go to Office Max and turn in 5 cartridges at a time ($3.00 each). Voila.....$15 off on new cartridges.|||google is your friend.