You can get an "official" set from CannonKeys once they restock:

https://cannonkeys.com/products/nicepbt-noel

I have em and love them.

This is a really fun photo!

There have been a few popping up on eBay due to dead stock being found. I was lucky enough to scoop a set up in a TKC Portico bundle for $99.

Banksy designs art via stencils for other people to go and get them setup.

Stencils for large outdoor art pieces has been the standard for a few decades now because you need to be quick to avoid police noticing.

It also adds a level of plausible deniability in that if Banksy or any other members of the collective get caught, it can always be played off as "We just got paid for this gig, that's all we know."

I keep my switches in jars so they look like candy on my shelves.