A proof that environmentally friendly behaviour makes economic sense

One thing I enjoy about living in Almaty, Kazakhstan is an abundant supply of fresh and tasty vegetables, fruits and berries - with so much sun and Uzbekistan (with several harvest a year) being relatively close one gets much better selection than in the Northern Europe.

I do the shopping of fruits and vegetables at the same small store run by a Tajik family. All the berries are packaged in plastic containers like this (and the rest of fruits and vegetables in the countless plastic bags) which come "for free":

It is not a secret that production and throwing away the plastic has created a gigantic problem for the nature - and it only gets worse. So what I did is basically re-using those plastic containers - washing them and bringing back to the family I buy berries from. I did it few times already - and the guys were positively surprised (recycling is not very "in" in Kazakhstan unfortunately).

What have I gotten in return besides a good feeling of doing something good for the environment? Discounts on every shopping I do there plus selection of the freshest stuff (the seller guys have become much more helpful and started to treat me with more special care "Do not take these tomatoes, let me pick better ones for you"). So, every time I go there I not only get a little bit less costly shopping, but also fresh selection - which means less potential waste and less need for an additional shopping.

Environmental behaviour can result in a win-win-win situation (for the seller, for the buyer and for the environment!