I seen that at lowes also, runs on a battery pack https://www.lowes.com/pd/ASMOKE-256-Sq-in-Blue-Pellet-Grill/5015082673
HD has the same one Bruce linked to but it's $ 229.00
So it's the fastener not the vent?
If so then yep switch out to SS bolts and add lock nuts like these.
https://www.homedepot.com/p/Everbilt-1-4-in-20-Stainless-Steel-Nylon-Lock-Nut-3-Pack-800131/204274167
It's next week the last Monday in May.
They did that so everyone has a three day weekend.
I'm still working on a head count but whole packer brisket for sure.