Where to buy vents

[sjmc72]

I saw the vents to put on the wall behind /above the stove tops a few days ago, I want to place one now but I can't find them in the market anymore and I'm so sad! Are they discontinued or am I just not looking well. What category are they in?? Any help is appreciated!
Thanks!!

[luna2cute]

I think miscellaneous wall accessories? It's not in the kitchen section...the other wall section. Lol