I tend to abandon cleansers when I move apartments, which admittedly isn't that often. It's just easier to pick up the laundry detergent and such that I need on the fly than tape or bag up endless loose powders.

Stuff like half-liter sodas seem to always cost different prices here, but that's just because there's invariably a sale or discount or promotion going on and at some point I just stop paying attention to them. Even when it's marked there's a point where it's not worth the effort to buy two cans of Coke Light with two Violet Crumble bars just because it saves a net of fifty cents total.