I bought mine from a local retailer, Unicorn Electronics in Johnson City NY. They even have extra remotes, or control boxes you can buy if something stops working. Worst case scenario, they last 1 year, and I spend $35 next year. Only takes 2 minutes to put up if you're not wiring it into the RV.
I may yet drill through my wall and hard wire it... But I haven't even camped in the TT yet, and I can't bring myself to drill through the walls yet! For now I'll just plug it in when I get to the campsite. It's really the same idea as stringing up party lights, only the lights stay up permanently, you just plug them in and they're ready.