For you west coasters, here is one that I used to be associated with(Before I moved to WA). The collection that gets brought is simply amazing. These guys have some awful rare stuff (Marble Man 2 Prototype, Big Bang Bar Pinball, Bradley Trainer, etc)
They also have games for sale and some Stern Retailers there as well.
Ultracrap used to attend this thing but I don't think they do anymore.
You've got a little over a month to prepare if you want to go. I may just fly down for it.
California Extreme