I bought a bag of Long Fibered Sphagnum Moss at Home Depot in the gardening section. NET CONTENTS 432 CU IN, 7L, which is ALOT of moss! It is pretty inexpensive ($3.97). I believe the brand is Mosser Lee Company. Since it's completely dried, it lasts for a long time without going bad. I think I've had it for at least 5 months and I am only about half way through. I usually spread it out, then spray it or if its alot, pour water on it from a bottle and then mix it a little by hand.