In Australia, Linden.
You can probably buy similar stuff overseas though. Being just a by-product of cheese manufacture after all, I'd think so.
We've got a number of companies doing the pure WPC (or optionally, pure WPI, etc.) thing around here. There must be some
in the UK...
Mostly it comes in pretty plain looking resealable bags, rather than elaborate tubs (which do look better, I must admit).
Not that I care, but some might.