Does anyone know where i would have the best odds of getting a Thorn or Kidde B5?

Not my photo btw..
I love how these Thorn/Kidde B5s look and i wonder how feasible it is to acquire one for my collection, where i would have the best odds of finding one, and how much it would be priced if it was there?
I know its a lot to ask for, i am just wondering and these forums are a lot better of a place to ask than the r/firealarms subreddit lol

Nowhere else but Ebay as far as I know, where any collector gets really anything: just be patient & one might appear before long.

those pulls are very rare on ebay, you’ll just have to wait until someone sells theirs