Hi Pattymcb,
Well you are very fortunate indeed because Phoenix is one of the best areas in the country to buy a high quality and value mattress!
Post #4 here includes your better choices in the area and 3 of the manufacturers there are members here (which means that I consider them to be among the best quality and value in the country). If you purchase from the two where your the membership benefits includes the local outlets … don’t forget to let them know you are a forum member here so you can receive your 5% member discount.
They are knowledgeable and helpful and will help “fit” you to a mattress that matches your needs and preferences.
I wish everyone in the country had the same type of great choices that you do 
Phoenix