In Finland they have bottle/can machines where you feed in your empty bottles and cans (various sizes) and it scans them and tots up how much money you get back. It's been a while since I lived there, so I can't remember the exact amounts, but at the end it printed you out a receipt which acted as a coupon for the value which you could then spend in store (you may have been able to convert it to cash... I can't remember

). It definitely led to more recycling - I was in a halls of residence, so full of students who were more than happy to get money back

.