Late shift at supermarkets may get you free food via food waste.
PurpleJade:
Working in food service or downloading every food app and checking every possible deal and looking for whatever is the most calories for the cheapest price.
Pro tip, when not using a deal, check with the store directly as they may offer slightly cheaper prices.
Also, check for any work discounts, I get a small discount for one or two services this way.
Check for any other disocunt/rewards programs elsewhere as well, I got a free sausage breakfast roll the other day via my parents cable provider.