N.M. Admin. Code § 1.4.1.41
Best and final offers in a request for proposals are sometimes appropriate and helpful. An offeror's best offer should be included in that offeror's original proposal and no discussion or changes to that offer should be allowed prior to selection of the offeror as the successful offeror unless negotiations are undertaken pursuant to 1.4.1.39 NMAC of this rule. After such selection of a successful offeror or offerors (for a multiple award procurement) and before final award, an agency may negotiate with the selected successful offeror(s) for the best possible terms for the state but such negotiations shall not change the successful offeror's or offerors' (for a multiple award procurement) proposal(s) to the detriment of the state. Award in this context means the final required state agency signature on the contract(s) resulting from the procurement.
N.M. Admin. Code § 1.4.1.41