Nothing as grand as the things posted above but I guess I would say my Howler battery operated flicker lights. They still work and are MUCH better than then ones the stores sell now.
He's a one-man show who makes FANTASTIC props and sells on eBay. I've bought probably about 10 full-size props from him. Here's a few...What is Patrick Studios? Unfortunately googling that results mostly Spongebob-related stuff.