Depends on, HEF - I haven't got all bills from my games, I just happened to have the Div one - after the EUR was initiated in Europe, game prices went up steeply in Germany. Average price previous to EUR was 30-40 EUR(60-80 DM), now you rarely find a new game under 40 EUR (fresh after release, prices go down after a while, but if I'm interested, I can't wait).
Kiya
TOEE, Engl. version = 39.53 EUR via amazon
NWN = 49.90
NWN addon = 29.95
Syberia, budget = 19.99
Gothic 1 budget = 10
BG 2 = 45 (EUR, bought in DM, so double the price)
IWD = 30 (EUR, but bought in DM that time, double it)

enough numbers to compare?