Finally found my way back to this thread again.
Hey Fert:
ME personally would keep looking on the composts.
The Peat Moss right there.. that's what I use and I can HIGH-ly recommend it. It's the exact same thing from the same company as ProMix without the mycos. For the extra $30 you just saved, you can purchase mycos separately from the same company btw (Premier - Mykes brand) and get enough mycos to last you a few years.
Be careful selecting composts... it can make or break the garden, specially in containers. For outdoor use that stuff is mediocre. I'd keep looking.
Not sure where you live but I will point you to a few tried and true bags of great compost.
BU Blend from Malibu Compost - I'm on east coast and can get this. They are a biodynamic certified dairy and I think they raise meat as well of course bio-dynamically. Which is SEVERAL steps above OMRI organic.
Coast of Main Lobster compost... what I use in my gardens. I've also used it in containers and in raised beds ... so another 1 tried and true.
Both of my suggestions I've tried and used... the same with the CSPM.
GOP mentioned CSPM and sources. Of course its Canadian, eh?
I believe there are only a few companies that have a permit from the ministry of Interior to harvest CSPM commercially.
I also believe Premier Tech is the largest. They sell close to where they get the source. So in Ontario they source the CSPM from Ontario.... I've seen them harvesting in action in Ontario. I can say that you would think this is an invasive practice... not so. I could hardly tell they were actually working and harvesting. Once they were finished I couldn't tell they were even there. They made a dirt road... didn't even use gravel, just cleared a path for trucks to go in and out.
Not sure what Tim Wilson (aka Microbeman) meant when he said one provincial source was "better" ... I'd have call that splitting hairs. I mean the water in Ontario is just as clean as the water in Alberta or BC or where ever in Canada. I'm not even sure what criteria he was using. I'm doubtful it's much if at all different or "better". I've seen where that peat moss comes from out of Ontario... it's all GREAT stuff. It's harvested in wilderness areas ... made by mother nature.
Maybe someday there will be ACSPM (Alberta Canadian Peat Moss) - best of the best.