Hi,
This website has locations in Miami and Phoenix AZ.
SunElec.comLook for panels with a frame and in the approximate voltage you desire. They are close to $1 per rated watt at this site.
If all else fails, you can always just install a 12 volt nominal panel and a PWM controller that cost between $25 and $35 for a 20 amp rated model.
I made my mounts out of 2" angle aluminum from Home Depot. I drilled 3 holes for #10 screws into the roof and 5/16" hole for a 1/4-20 bolt into the panel.
I ran my wire down the refrigerator vent, to the controller, then to the battery. It is pretty simple to install.
I was looking up their website today, and saw this 145 watt panel for $229. You can wire two of these in series, then to the MPPT controller that you already have if you have enough amperage capacity left.
http://sunelec.com/solar-panels/12v-solar-panels/solarworld-145w-solar-panel.html Or run them with a PWM controller to your battery. You do not lose a significant amount of power by using a PWM controller.
Good luck!
Fred.