Update 9/9: AZGunnut IM'd me that he was out of town and forgot to send payment before leaving. He has been informed that his 1 CS was sold to a buyer on my "waiting list". He IM'd me and is going to send payment for one, and possibly two smoke grenades.
He placed a pre-order in a "Group Buy" and never paid. IM invoice with payment instructions was sent on 8/18. As of today, 9/7 payment has not been received. Follow-up IMs went unanswered. Order totaled $136 for 1 CS and 1 Violet Smoke. He even said in his original IM pre-order that he might even want more.
From my original post (in size 5 font):
Please do not reserve any of these if you are not absolutely positive that you can follow through with payment within 10 days of placing your order.