To determine a fair price, you first need to know the value of the property based on the market area, market conditions, market trends, location, amenities, condition, site size and usage, and appropriate adjustments for differences to comparable properties (active and sold) within the market area. Clayton homes are generally considered one of the better manufactured home builders in the state.
You can find appraisers in your area listed in the Appraisal Subcommittee National directory - Search in County or City option - http://www.asc.gov/default.aspx?id=11
You can also find appraisers in your area in the Arizona Board of Appraisal Directory by County - http://www.appraisal.state.az.us/directory/Default.aspx
You will get the accurate information you need to know, not just what a sales person thinks you want to hear to get a signed contract with them.