I have a bag of vermiculite, perlite, and Miracle Grow Organic Choice. I'll probably do a 20/30/50 mix of those three.
Yeah everyone bashes MG but its fine for now. The organic choice doesn't have an extended release feeding system like the other MG soils, so I figured that it would be just fine.
I'm pretty sure ProChoice is pretty readily available at most superstores, and some people use that without any problems. but then again that might all be imagination.