My Nephew (a Dr. Who enthusiast) just went on a Church mission, and My sister got him a Pocket Watch, It’s gorgeous, but the paperbox it came in, along with the crappy foam holder, not so much.
I got the EVA foam from Joanns, it was 3’ by 4’ for $15… there might be cheaper elsewhere but after 4 hobby shops I was VERY happy to get a couple sheets and be on my way.