How secure are these online shops?

[Omanes Alexandrapolites]

As far as I know, they all are reputable retailers which use powerful internet security and encryption to protect their customers. Amazon is particularly popular, although you have to be careful if you are not buying from the company themselves - third-party sellers, although most of them are trustworthy, aren't always guaranteed to deliver the goods in the condition you expect. You should read their reviews prior to ordering if that is the case.