The concert at the Concertgebouw is pretty famous and it's well documented by a good audio recording from some (cannot remember exactly now) dutch radio station. You can find ROIOs (aka bootlegs) of that particular concert and many others at record fairs, a few good record shops or internet shops but my suggestion for bootleg recordings is just type "pink floyd concertgebouw" or "amsterdam 69" in your favourite PTP sharing program search window and... enjoy.

__________________
"Don't you know there ain't no devil, it's just god when he's drunk." Tom Waits