To keep things affordable, I really suggest you shop around. I don't know how the stores work (nor what the dollar is to the CAD), but we shop around a lot, between Henry's (now Whole Foods......darn it!), Trader Joe's and Whole Foods. Everything we can't get at Trader Joe's we go to Whole Foods and then Henry's (smaller selection, a little more expensive than Trader Joe's). We end up spending about $250 to $300 a month on grocieries (and under $100 for eating out).
But that amount for groceries doesn't include the CSA
Our CSA is a flat $26 per large box, payable every quarter. See if you can find one that's reasonable throughout the year. Though 750 through the summer doesn't seem TOO horrible....I guess that would depend on what you think you would spend going to the store....but keep in mind all the produce that you will be forced to eat from the CSA that you would never have bought! And how much more nutritious it is.... Oh that red chard we had tasted wonderful, and we never
would have thought to buy it!
One more thing...on organic meat, we just started buying organic dark turkey meat. (We get the dark because it is the only one not previously frozen) It is significantly
cheaper than organic beef and is quite flavorful. I think the spaghetti that we made a week ago with the turkey was the best I've just about ever had....
Good luck finding ways to make healthy eating cheaper
I know how hard it is (I also have diabetes, and so have specific needs....protein all the time!)