BOEING has published what it calls its 2006 price list. However just as with a car if you phone up your friendly salesman from Seattle and tell him that you have cash no doubt he will make you an offer. But ask him for an early delivery slot and you might be disappointed. You could suggest calling Toulouse. A 737-600 comes in from $45.5m upwards, $205m will give you a nice freshly painted 747-400, and at the very top of the list the 777-300ER, with all the goodies, is $253. The yet to fly 787 starts at $125m and as with most of the aircraft has a choice of engines.
http://www.boeing.com/commercial/prices