I absolutely can not take credit for this, it's just an adaptation of the poor mans pod from the PF Tek but it works almost as good as a bubbler and I thought some people here might like it.
Cut a two liter bottle right where it starts to taper in. Add about a tablespoon of water to the bottom, so it's just underneath the ribs and not going to be soaking your pot. Put a small pot with your clone of choice inside and put the top back on. Every other day or so unscrew the cap and blow into the top to exchange air. I have had wonderful results with this and the best part is it's free!