Since when is dirt cheap? THe only thing I find more revolting than buying a garbage bag is buying garbage bags to hold dirt, then buying new dirt...
I do pasteurize - damp soil at 250 degree oven for 1 hour (I think you only need 180 for 20 minutes, but I'm lazy, id prefer to leave a decent size batch)
left over garden matrials from various projects include ~8 cu ft pearlite and vermiculite, tons of pool filter sand (600 lbs, so not actually a ton, but lots) soilmaster infied top dressing (baked clay larger than sand, smaller than gravel)- and 12 cu ft of peat moss. I have a small compost area that's mostly oak mulch- very low pH (high acid)
Those of you who have hanging planters and pots - what do you do for your annuals and veggies? I'm zone 7a
Fertilization is something different-