These things work great, and I use them all the time, but getting them from Amazon is more expensive than you might get them in the store (20 cents versus 12 cents). If you can't get them somewhere else, though, you can buy them here. I get a commission from Amazon. 
Jiffy Pellets For Growing Marijuana
Jiffy pellets are a great planting medium for newly germinated marijuana plants. They are compressed discs of peat wrapped in a fine net covering. They are an excellent tool for growing marijuana.
You soak the jiffy pellets in PH balanced (6.5-7.0) water for a half hour or so and they expand.
Remove the excess water once they’ve expanded. You want the environment wet, but not soaked.
Put them in a humidity dome. I’ve got a factory made one, but you can make them out of clear drinking cups taped on top of each other as well.
As soon as they start busting out of the ground I put them under fluorescent light. I like sooner rather than later because if I let them get away they try stretching up to find light and the stems might get too leggy.
The good thing about peat pellets is that you never have to switch the plant out. You just plant the pellet into the next medium (dirt or hydro).
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