Where to get a buttload of good epiphyte potting media for less than an arm & a leg?

[astrid]

Hey everyone!

I have had a recent potting disaster and have decided I want to buy a giant thing of potting mix so this never happens again.

Where can I get something like 8 quarts or more of a good mix of medium bark and charcoal and perlite for maybe $20?

I am having bad luck with storebought potting mixes. One went moldy with my plants in it, the second was infested with flies, hence why 4 of my orchids are dying in sphagnum while the 2-day "express shipped" mix that I ordered has taken over a week to arrive...

Where can I get that?

Or where can I get a nice big bag of bark chips?

Thanks in advance for any helpful tips!

I can mix in charcoal and sphagnum on my own, but the bark chips are proving hardest to find.
See my video if you want to see how bad the black gold mix is...