Bert - I'm in the same boat as you re: ProMix. There is one supplier close to where I live. I faithfully use it and it was $41 for a 3.x Compressed bale but since the election when growing medical marijuana was passed, it is now $48.
Miracle Grow was $14-$15 so was no cheaper; just worse mix.
I have a ton of perlite so bought a bale of peat moss from Lowes for $11. I have one empty EB so am going to try it.
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BTW - I solarize the mix at the end of the season so do get multiple seasons with it.
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