What's your most expensive prop purchase regret?

[v137a]

I picked up a shell of a military laptop from the Netflix movie "Mute" off of a Prop Store auction, mostly because I found it a fascinating object. It's heavy as hell and doesn't really display well, so it's just hanging out on a shelf in the basement. It wasn't necessarily expensive, but it's certainly the one I regret the most because it just doesn't have a place or an emotional resonance.