The process usually requires 90 days to complete (from publication of solicitation to final Supplier Contract or Purchase order). ➢ Requests for Proposals (RFP).Pima County's Open and Closed Solicitations are posted below. Please register or login to see details of all open opportunities. Browse Bid Opportunities. Please use the BidNet link below to see solicitation information. Call 800-835-4603, option 2 for help with BidNet registration. PROPOSAL SUBMISSION: An authorized agent of the Proposer must sign proposal.