Student Survival - Shopping Tips

I am making a sort of personal cookbook for my son in the fervent hope he gets his grades and starts at university next year. The thought struck me while starting on that that shopping tips would be even more useful, given he can do quite a few dishes already, but has never yet done a supermarket (or other) shopping run.

So for what they are worth, and in no particularly logical order, my top tips for student shopping survival:

1. In supermarkets check out the 'ethnic' food shelves. You'll find rice, coconut milk, spices and plenty more that is appreciably cheaper than the same foods (different brands) on the next aisle.
2. Recipe bacon aka cooking bacon is a wonderful deal - the ends, off-cuts and errors not suitable for pretty packets. Same bacon, and often with big chunks perfect for stews. And who cares if their bacon butty is made up of mis-shapes?
3. Tinned tomatoes - buy the cheapest - basic, value, whatever they call them in your store. Some colour variation, maybe a tiny bit of skin, but no difference in taste or standard. Which price sounds better, 31p or £1?
4. Don't be put off by Aldi and Lidl's lack of fancy decor, they do good food and at low prices. Lidl's Parmesan is the best supermarket one I've found, and it is between 35% and 50% cheaper than the stuff from certain other big name places.
5. Markets can be brilliant for fruit and veg, much cheaper than supermarkets and ethically often great as veg tends to be local.
6. Chinese supermarkets are another source of good and cheaper ingredients. When I get the chance I buy noodles in them for about a quarter of the Sainsbury's price, and tins of bamboo shoots and water chestnuts for 60p to 65p compared with 90p.
7. 'Basic' peppers again are a bargain, just more interesting shapes than the dearer ones. They don't come from bad plants. They are not 'off'. 
8. If you buy veg etc in supermarkets, a quick glance at the bagged up price and the loose price per kilo is worthwhile. Mushrooms you pick and put in a paper bag are a good 10% cheaper than the plastic boxes. 
9. For meat if you can find a butcher's shop (or stall on the market) use it. They will do small bags of mince (ragu, chilli con carne, etc) where supermarkets tend to do 250g minimum. Meat as spice in a ragu needs 100g or less.
10. Don't buy the cheapest bread. Bread should be a pleasure, and the crappiest sliced rubbish is not. Same thing with 'mild' cheddar - and with the latter you need twice as much to get the same flavour as you have with strong stuff, so it's a false economy.
11. Buy in season, when gluts mean cheap prices. The other side of this is don't buy stuff flown half-way round the world - food-mile guilt and the freight adds to the price. 
12. Some 'specials' are worth going for, others not. BOGOF fresh foods risks the 'free' one (not free) going off, so you wasted money and resources. Tins, however, are good value as they keep.
13. Own brand works for simple things like rice, pasta and bread. A brand's price includes a hefty proportion of advertising spend and something for sharper packaging. Who cares?
14. Protein isn't just found in meat. Mushrooms, tofu, Quorn, and beans are good alternatives, and a lot cheaper.  

Any other suggestions?