Zweitausendeins had these Fantasy sets for years in the catalogue, for 5 Euro/CD (80 Euro for the Pepper set). That's a normal price, given the cheap packaging.
Then they decided to sell out these sets. The price of less than 2 Euro/CD was exceptional, and they were gone very quickly.
As far as I know, the remastering of the sets is identical to the US sets. I have the Pepper, Miles, Monk and Bill Evans Riverside sets and the sound is decent but dated. ZYX started their own (partly horrible) remastering only later.
I find the official prices of the US sets is to be too high. They're almost as expensive as Mosaic sets, but their collector's value is much lower.