To register as a vendor with Salt Lake County visit the Utah Public Procurement Place (U3P) website. Owner's representative must receive invoices (14) days from the date the requested work was completed.Complete the form below to join our Vendor Contact List and be the first to receive invitations to vend at events that align with your business. SLCC utilizes an online bidding system. All procurement contracts, except Simple Service Contracts, must be submitted unsigned in SLCCBuy using the Procurement Contract Request Form. The Probation Office in the District of Utah requests bids to provide Substance Abuse, Mental Health, Sex Offender, and Drug Testing services from time to time.