Most organic soils are found on the cheap isle. My suggestion is to stay away from the name brands of soils and go look on the no name bag isles. You can find all the ingredients to make your own organic soil there. Organic humus, manure, peat moss, and a host of all kinds of goodies like sand and of course your dolomite lime..
A great do it yourself mix is
1 40# bag of organic humus
1 40# bag of organic soil
1 bag of perlite
and adjust the pH with dolomite lime ( pulverized)
Ph is adjusted as 2 teaspoons per gallon of mixture as a general pH stabilization plan. Check the pH first though and if it's just slightly off then just add a half of cup of lime and go with it and you will be set......If you want to pay 30$ a bag for soil then go ahead. But you can make 10 times the amount of the same quality soil for the same amount... Heck you can even buy mushroom compost too at Lowes and home depot and most other garden stores