Different blue HP 50g model variants

[jebem]

I apologize up front if this has been discussed before, but I would like to have more insight on this Blue series.

Is the Blue series a regional edition available only in a couple o European countries?

I ask this because the only ones I saw for selling a few years ago in the Internet sites were from Germany and Spain.
An I never saw a Blue 50G in any physical shops in my country.

Meanwhile the 50G Blue machines apparently are a rarity now, and the ones that I can find are used ones and have very hefty price tags.