I’ve been trying to find one as well. I emailed Pit Boss asking about a shelf for my PB340 and they said they were “out of stock, but keep checking.” That was 9+ months ago.
I’ve had my Pit Boss 340 for 10 months and it’s the 1st pellet grill (or smoker) I’ve owned. I used it 4+ times a week for the first 6 months and now I use it 2 or 3 times a week. It never dawned on me that there may be a forum available to pick up a few tips, but it finally hit me this...