You could always look into making your own; the organic section has lots of recipes, some more elaborate than others. I made mine by buying some basic (no nutes added) topsoil, adding sand, coco coir, and perlite for water retention and air, then mixing in cow manure compost, mushroom compost, and earthworm castings and fortifying with some added nutrients. You could as a simple starter use my basic setup. I added a number of different nutrient additives like bone meal, azomite, etc. but a basic organic all purpose nutrient mixed in with those would get you a fairly strong starting soil that's fully organic and loaded up on nutes like ready to use super soils. Might want to consider adding dolomite lime to it as well as a basic pH regulator.
Just make sure to let it cook for a few weeks before planting (and consider buying some Myco and biological inoculate to add when planting for best results). It'll be too hot to use immediately after mixing.