Have you been in those meetings with the vendors where they start to quote the TCO (total cost of ownership) and ROI (return on investment) figures that practically show the systems paying for themselves in saving within 8 months?
Most of these figures are based on a view of operational costs and acquisition costs but the more subtle/softer costs such as training, user management, downtime, internal consulting, etc. are usually missed.
TCO/ROI figures are good to give you an indicator but should not be the sole reason for purchasing. Have your questions prepared before you meet the vendor so that you can get an accurate picture of the cost involved and you don’t get any hidden surprises!