Tony, the mixture you referenced sells for about $4 per quart at Home Depot. In comparison,
1/4" Sequoia Orchid Bark sells for $12-$15 per 3.5 cubic foot bag (thats 104 quarts) at horticulture supply outlets and works better than any other mix I've ever tried. In San Diego county and many other locations across the U.S. it's available from
Crop Production Services.