Can you request quotes asking vendors to provide the number of widgets they can sell within the budgeted amount of $25K and select the vendor who can sell the most quantity for that dollar amount?
Since we do not have all of the facts pertaining to your requirement, solicitation/contract or contractor(s), the following answer is based solely on the background and question provided. As we do not have access to the contract folder or particulars that apply to this situation, we highly recommend you consult the Contracting Officer and possibly the Legal Office.
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There is no prohibition for the release of a budget amount. It is done on occasion when acquiring services in a performance-based environment. However, it is only done when it is absolutely necessary and is in the best interest of the Government as determined by the contracting officer. In this case, I would suggest that you ask each solicited source to provide the price of the widgets and include the quantity discount breaks (e.g. $10.00 for quantities up to 100, $9.00 between 101 and 200, $8.75 for quantities over 201, etc.).