I generally buy organic groceries at my regular grocer (Loblaws/ Real Canadian Superstore), and most other stores have organics sections as well.
  
  
  EWG's Shopper's Guide to Pesticides in Produce
  
  Dirty Dozen (Buy these organic)
  1 Apples
  2 Celery
  3 Strawberries
  4 Peaches
  5 Spinach
  6 Nectarines – imported
  7 Grapes – imported
  8 Sweet bell peppers
  9 Potatoes
  10 Blueberries – domestic
  11 Lettuce
  12 Kale/collard greens
  
  Clean 15 (Lowest in Pesticide)
  1 Onions
  2 Sweet Corn
  3 Pineapples
  4 Avocado
  5 Asparagus
  6 Sweet peas
  7 Mangoes
  8 Eggplant
  9 Cantaloupe - domestic
  10 Kiwi
  11 Cabbage
  12 Watermelon
  13 Sweet potatoes
  14 Grapefruit
  15 Mushrooms