Here are some more currently selling comps from Landwatch:

This one is just a bit north @ $10,497 for 5 acres: http://www.landwatch.com/Mohave-County-Arizona-Homesite-for-sale/pid/289460780

This one is 10 acres and it's priced @ $15,887 and it's right by our lot: http://www.landwatch.com/Mohave-County-Arizona-Farms-and-Ranches-for-sale/pid/200471468

This one's a bit north and it's 5 acres @ $17,400: http://www.landwatch.com/Mohave-County-Arizona-Land-for-sale/pid/25044936

This one's also a bit north and it's 5 acres @ $11,900: http://www.landwatch.com/Mohave-County-Arizona-Land-for-sale/pid/187000185