From Interlock Rochester Wiki
Ok, so the current Adafruit order wishlist total, in dc-friendly format, looks like this:
12.50 30 + 28 + 19.5 + 28 + 28 + 15 + 25 + p 186.00
This is as it stands now, with David K and Carl having chimed in.
I've got an shopping cart I've printed out with ~$200 worth of stuff on it, but I don't know that I want to order it now right away. But, I could pitch in as much of it as necessary to get us to hit the $420 that would be a no-question big enough order to get the discount.