There are 3 private pre-schools in my neighborhood and they all charge from 1200 to 1600 (I am including meals).
What neighbourhood is that?
I'm most familiar with the area near Hala Stulecia (not a cheap area) - and for instance - male-gwiazdki.pl/oplaty.html - comes in at 1100zl for 12 hours and 5 meals a day.
I'm looking around now in Wroclaw, and 1000zl a month including all meals, in a very nice private nursery seems to be the going rate. Of course, there are more expensive ones, but for a "normal, but decent" one - 700-1000zl is about the going rate, and that's for all day.
(as for the American one, I wouldn't touch it with a bargepole - it's ran by Indians.)
Still can't wrap my head round paying 1500zl for a normal Polish pre-school though...