The deeper picture
Initially, the purchase price you're looking at contains A) software licensing fees (usually by user or module) B) Consulting and Implementation fees (charged time and materials by the hour) and C) Annual Maintenance (normally 18% - 25% of initial purchase price).
And here's another classic pitfall - Conventional Wisdom (CW) says we operate with three bids, three vendors to insure a fair price.
While this can be an accurate way to set your A) Software Licensing Fees - it means NOTHING when talking about B) Consulting and Implementation fees.
See, once you've purchased the software - regardless of how much the consulting fees run over budget, it's too late to switch back to another vendor.
Resellers split sales revenues of the License Fee with the publishers, and then make 80% of their annual revenue on Consulting fees - and the Consultants annual bonus is based on how many hours he/she bills for the year.
It's in their interest to stretch out the implementation.
As opposed to software publishers who install their product - their revenue is software driven - the more software they can sell, install and move to the next project, the higher annual revenues for the software firm.