Just heard from Mike, this is what his reply was re group buy identification and process.
“
Hello everyone - this is Mike from Tsolutions. I want to thank jebinc for setting up this group buy.
We need at least 20 orders to offer the 15% discount so the best way to do it is for everyone interested to respond here and as soon as we hit 20 interested users we will create a coupon code and post it here. If you want to email me I will keep a list as well and respond with the coupon code when available.”
I asked for an email address for him as well, in case you want to contact him directly.