I am not sure if you can get them in pink in Canada, the most common colours are white and black. There are multi coloured sets that have red, blue, green and yellow.
Walmart, Canadian Tire, London Drugs (not sure if you have those in Ontario), Rona have them. I think Home Depot might carry them. Zellers and Superstore might as well, but I haven't seen them in a while there. Most sets have 13 grids for about $20, but do go on sale once in a while.
When I look on websites, I search Cube Storage or Cube Shelving.
Also check Kijiji or other classifieds sites as well as garage sales. You can get great deals.