I am going to experiment this year with my mix to try to accomplish these goals:
Keep the weight low
Keep costs low too
Lower water retention of mix vs. Pro-mix only
The ingredients I found semi-local to me:
Pro-mix BX 3.8 cu ft $27.99
Pro-mix BRK 2.8 cu ft $14.99
Coarse Perlite 20lbs $20ish
Coarse Vermiculite 20lbs $20ish
Turface All Sport 50lbs $16.80(think I can do better)
Pine Bark Fines????? I can't find them fine enough so I might use Pro-mix BRK
I am going to mix it up so actual peat will be about 1/4-1/2 of total mix. I mads some tonight and it looks promising. I will take pictures of the mix and raw materials tomorrow. The compaction and weight is already better than fully saturated Pro-mix.
Does anybody want to share some mix recipes that meet my criteria?