the setup Tygo posted is pretty much what I use, though I've got a different stone. the small 02 tanks are available from Home Depot for about $12. I think they sell the regulator for $12-14. stones are available for varying rates depending on type, size etc. a couple of months back, my local home depot had the 02 cannisters on sale for $6. I bought about 1/2 dozen of them. they last for quite a while as you don't need to run the 02 for more than a couple of minutes per batch.