Arizona Administrative Codes (AAC)
Find the K-12 codes for procurement on the Secretary of State's website under the Arizona Administrative Codes, R7-2-1001 and subsequent.
http://apps.azsos.gov/public_services/Title_07/7-02.pdf

Arizona Office of the Auditor General
This links you to the main website for the Arizona Office of the Auditor General’s Office. There are other useful links here, including the State Legislature and the Uniform System of Financial Records manual (USFR).
https://www.azauditor.gov/

Arizona Revised Statutes (A.R.S.)
This links you to the Arizona Revised Statutes site located within the Arizona State Legislature’s website.
http://www.azleg.state.az.us/arizonarevisedstatutes.asp

Arizona State Procurement Office
This is the main website for the Arizona State Procurement Office.  https://spo.az.gov/  

Arizona State Procurement Office-STATE CONTRACT LISTING (ProcureAZ)
Look up information for state contractor vendors.
https://procure.az.gov/bso/

AZPurchasing
Register with AZPurchasing and find out more about this useful vendor resource.
http://www.azpurchasing.org/

System for Award Management (SAM)
This is the Official U.S. Government system which contains the electronic roster of debarred companies (Entity) or individuals that have been excluded from Federal procurement and non-procurement programs within the U.S. Government and from receiving Federal contracts, some subcontracts, and certain Federal financial and non-financial assistance programs and benefits. This system has combined the data from the Central Contractor Registration, Federal Register, Online Representations and Certification Applications, and the Excluded Parties List System. Federal procurement laws require all programs funded with federal dollars to verify that potential vendors or individuals are not listed on this system. https://www.sam.gov/portal/SAM/##11  

Greater Phoenix Purchasing Consortium of Schools (GPPCS)
Find out information on what GPPCS is, and see a listing of available contracts.
http://gppcs.org/tiki-index.php

Maricopa County
This is the official Maricopa County website.
http://www.maricopa.gov/

Mohave Educational Services Cooperative (MESC)
Find information on the cooperative, as well as contracts awarded and more.
http://www.mesc.org/

Strategic Alliance for Volume Expenditures (S.A.V.E.)
Find out more about this purchasing cooperative, and see a listing of available contracts.
http://www.mesaaz.gov/business/purchasing/save

Town of Gilbert
This will link you to the official Town of Gilbert website.
http://www.gilbertaz.gov/

National IPA (formely TCPN)
Lists cooperative contracts and vendors awarded
http://www.nationalipa.org/Pages/Contracts-search.aspx

US Communities
Look up contracts and vendors under the U.S. Communities purchasing cooperative.
http://www.uscommunities.org/