Well, I don't know about you, but I hardly need bags for general waste any more.
All food waste either goes into my own compost, or into the green wheelie bin for composting by the council -- my council now accepts meat and cooked leftovers.
Paper, cardboard, metal, glass and plastic packaging goes in a recycling box for kerbside collection.
That leaves a very small amount of other waste, to go in the grey wheelie bin. It's seldom a quarter-full when the fortnightly collection day comes. There's just no need for bags, because it's all dry.
If you feel you need trash bags, you should pay for them. You can either pay for carrier bags, which you then re-use as trash bags, or (cheaper) buy a roll of actual trash bags.