Quoted from punkin:invoice number 305
My best guess based on the information posted in this thread, noting the latest invoice number being 305, and assuming everyone who put a deposit down on a Mermaid edition first joined the Haggis Clan, and also assuming 50 people were already Haggis Clan members and/or purchased Celts before Fathom was announced ... 135 of the 250 Mermaid editions have sold within a week of release.
Pretty good start. Go Haggis Go!