I bought mine locally. I didn't use it for a while, so it dried out and I didn't have gnats.
I had small white mold in the soil, but when I submerged it for washing/sifting, the mold floats and was removed.
The process I used eliminated the concerns you have about the product. (fill bucket half full of soil, fill bucket with water, stir and knead until all the floaters rise to the top, separate the floaters, and use the stuff on the bottom.)