Look what I found!  I searched the term "Guncoin" on GunBroker and found these:

https://www.gunbroker.com/item/750833343

https://www.gunbroker.com/item/750792661

https://www.gunbroker.com/item/750832049

https://www.gunbroker.com/item/750828316

They are all the same seller, SpeedyCycles, and he does accept other forms of payment, but he also accepts GunCoin.  Sweet