12 Miss. Code. R. 3-20-700.15
Allowances may be purchased under the direction of the Professional who should consult with the Contractor regarding the products and suppliers when making selections and designating products to be used. The Professional should notify the Contractor and the Owner in writing of the decisions made regarding these allowances. The amount of each allowance should include:
The Contractor should assist the Professional by obtaining a minimum of two (2) proposals from Suppliers when requested by the Professional. When selections have been made, the Contractor should enter into a purchase agreement with the designated Supplier.
Should the actual purchase cost be more, or less, than the specified allowance amount, the Contract will be adjusted by Change Order equal to the amount of the difference.
12 Miss. Code. R. 3-20-700.15