Only further evaluation can sort it out. Suppliers responding to your request for proposals won't include their best pricing in their proposal. They'll bid the highest price they think will get the deal under the competitive pressures they perceive. So don't rely on your bid process alone. Supplement it by negotiating aggressively with the highest level of authority at the supplier's organization responsible for the deal.
Price is usually the most negotiable element in any deal.
Most of the time, that requires significant contractual negotiations before you even get to negotiating the final price. Getting full value for what you pay for means getting a product or service that performs as promised within the defined architecture and getting it on time. Getting the best price is an important considerationin getting the best value. You want guaranteed flexibility and prices from your IT providers, without guaranteeing you'll buy anything at all. That may sound like too much to ask.