I plan on ordering MHRB this week for my first extract. Does anybody have a favorite vendor they'd recommend?
I would prefer a paypal friendly site.

I'm also going to invest in an MAOI inhibitor for an ayahuasca brew. Any suggestions here?

jimjamshop.com maybe the best prices around,good quality too,mao are out of stock btw
in swim opinion it's preferable to don't order mhrb with mao plants

Yeah, that makes sense.

What's your opinion on purchasing powdered as opposed to shredded MHRB. I have a coffee grinder, so I'm leaning toward shredded.

Get powdered.
You'll be glad.