Mymedicaldomains.com anyone heard of those guys and the medical domains? are those really medical domains? if so i intend to buy gastroenterology.md

Not really: .Md is the top level domain assigned to the republic of moldova. All countries have been given tlds. (.Us=usa). This site is trying to act as a reseller of these domains similar to how many companies resell the .Com domaines. The listed site for purchasing domains is http://www.Register.Md/ if you truly want one of the expensive domains, would recommend going through the official site.