Just a quick update, it should be about $4.50 per button ($4.00 per button plus $8.95 shipping to me divided by 19 buttons) plus an additional $3.00 shipping per person for USPS First Class in a bubble mailer.
I won't have time to send out the payment information and requests until later tonight, but that'll be on the way later. As soon as all payments are made I will submit the order.
Edit at 5:30pm - All PMs have been sent and I'll edit post #2 as payments come in. Thanks all!