Pro-Mix does make a variety of potting soil with myccorhizae already mixed in.
Their website seems to focus on consumer-size bags and cutely-named produsts, but they DO have an MR product:
MYCOACTIVE™: GROWTH ENHANCER
http://www.promixfindgrowtopia...
You might do better by going to a local hippy-hydroponic store and buy some cheaper MR. I got several ounces of a myccorhizae mix for a few dollars, but they MIGHT have been selected for that store's primary clientele. Woody plants tend to need different myccorhizal species than vegetables and flowers.
If I can find the "professional" Pro-Mix site, some of their bales have MR added, I think the two-letter abbreviation was "BX".
Yeah, now I'm getting closer to the commercial products:
http://www.pthorticulture.com/...
YES! This is the page for "real" growers' products, like bales of professional quality pro-Mix blends.. My suspicion is that, when I see small plastic bags with pretty colors and vague, salesy text, I'm paying twice as much for an inferior product.
http://www.pthorticulture.com/...
