I am a fan of the Volcom brand of thai curry pastes and this is the brand of curry paste I use most often.  They are available in supermarkets in the Asian food aisle.  I find that compared to some of the other ones I have used that the Volcom brand are a little less oily and have more flavour.  But by all means experiment with what is available near you, or use your favourite green curry paste you’ve been using for years.