LX 200 Power (or other 12v scopes)

I think I came up with an improved way to power the LX200GPS, or any other scope than runs on 12v for that matter. In anticipation of my new scope, I was trying to figure out how to power it. The 120v adaptor is $85, and is vunerable to power outages, variances etc. Just using the 12v adaptor means charging a battery (not a big deal), and the C-cells just aren't an option. Well, one trip to walmart solved all that. They sell a cool little converter (transformer?) in the automotive section. You plug one end into your 120vac outlet, and the other end allows you to plug in your Meade 12v power cable. Then I went to the Computer section and bought a UPS (battery backup) for $38. so for under $50 (plus the cost of the meade cord, which I already had), I can power my scope from the wall outlet, yet, I don't have to worry about power outages and variances. Comments?