It's just a different kind of oregano. Mexican Oregano is Lippia graveolens, Cuban Oregano is Plectranthus amboinicus, and Greek Oregano is Origanum vulgare.
Thanks for the link, the problem is their minimum order is $19.50 and they want $17.75 for shipping. So it's $40 from them. If they were local I'd just go buy one, but none of the local nurseries carry it. Maybe I can get them to order one for me, it might be cheaper.