I used to get it from the LPS, in a cardboard stand where they have the lift tubes for undergravel filters.
Or here: http://www.thatpetplace.com/pet/group/10637/product.web
Ooops, just noticed Greenland, I'm sure you can get it from the local pet store.
Or here: http://www.thatpetplace.com/pet/group/10637/product.web
Ooops, just noticed Greenland, I'm sure you can get it from the local pet store.