For a start, I got this compilation for cheap money in the wee hours of this morning. Not complete nor especially original, and not even all tunes are by Mancinini but just have been adapted by his orchestra, but a good start (and in itself a nice CD btw, it it doing its third continuous round over here).
You can check the titles for test playing, 30 sec each. You might be surprised how many tunes you know, just never had attributed to Mancini. And there is so very very much more by this guy...
http://www.amazon.de/s/ref=nb_sb_ss_...prefix=mancini