[cypher]

I think the amazon price is about as good as you'll get online, I think some shops like the range might sell it cheaper but if you need to buy online the price is about the same most places, I do buy mine from Mytoolshed where it's a bit cheaper but then there's delivery costs so it works out about the same unless yo buy several pots.
As long as it's water based that's all you need to look for really.