When I lived in Norway, I hardly ever bought bottled or canned drinks. Everything in Norway is expensive, but alcohol and soda were especially expensive relative to the cost of other groceries. Whenever I did buy a drink, though, I would always take the bottle back to the supermarket for a return on the bottle deposit.
As the video below shows, you put the bottles into the machine, the machine scans to make sure that the bottle was subject to the bottle deposit, and then it spits out a receipt that you can use at the store that houses the machine.
A bottle ≤500ml gives you 1 krone (~12¢ USD) back, and anything >500ml gives 2.50 kroner (~31¢ USD). If I took a few of my bottles and some of my flatmates’, I’d get quite a bit of cash back!
Here in California, we have a similar bottle deposit system. California Redemption Value (CRV) is 5¢ for containers <24 ounces and 10¢ for anything ≥24 ounces. It is a bit less convenient to return bottles here, in that bottle recycling centers aren’t as common and aren’t open all the time. I’m too lazy to return the bottles myself, so I let my roommate take care of this. When our communal bin of bottles gets full, she’ll drive them over to the nearest recycling center and get a redeemable receipt. Each load yields $5-10, depending on how many containers were in there. Not a bad way to save (or earn, depending on your perspective) a bit of cash!