From the aztaxpros.org website

The Tax Book & QuickFinder available through the Arizona Society of Enrolled Agents
Take your choice: Both top reference guides are available at discounted prices through AzSEA this year
Find answers fast during tax season with these libraries of tax facts. For more information about all of the handbooks, visit the publishers' websites: thetaxbook.com (discount code: 211) quickfinder.com (discount code: Q508) You also may order directly online ... but be sure to include the AzSEA discount code for best price! If you have already placed and order... Both publishers will honor the state discounts and donate to the Arizona Society of Enrolled Agents if you tell them the state's code: The Tax Book: 211 ... tel: 1-866-919-5277 Quickfinder: Q508 ... tel: 1-800-510-8997 If you have already ordered, call the publisher and give them the state code for the best price. For more information, contact:   Mel Brodie, EA 520-296-9079 mbrodie@att.net