One of the reasons you're having problems getting prices is because in many cases prices are very negotiable. My experience with vendors is that they price according to the use. In many cases, if they know the company is small (i.e., not a lot of money) they will greatly reduce the price of the product. Other things come into play too - such as growth potential (i.e., more licenses), increases market share (beat competitors) and the combination of professional services with the license. Some very rough numbers for a few I've recently dealt with - Sagent - $60K, DataStage - $80K, Informatica - $200K. Again - these numbers vary greatly dependent upon the tool and licensing structures (these aren't on the same project/machine).
Write an RFI and send it to the vendors to get the ball rolling and get some numbers.