Here in Sweden at least you can return PET bottles for money (about 0.10-0.20€).
$ 0.05 on all non-refillable single-fill containers that are 450 ml or less in size
$ 0.10 on all single-fill and glass containers up to 450 ml size
$ 0.20 on all single-fill containers larger than 450 ml
$ 0.05 for each soft drink container sold