My worst experience with an electric fence was long ago when one of my horses decided to rub the fence with me in between her and the fence,, we both got fried!
The best deal in El Paso is at the McCoys in North East off of 54, here is the link:
http://shop.mccoys.com/farm-ranch-yard/fencing/electric-fence
ETA: If the El Paso store doesn't have something you want, they will get it from the Las Cruces store for you.
Get either a small electrical unit or a solar unit, plastic fence insulators and wire. You don't need the big fancy ones that will hold a raging bull elephant. Call around around and ask about small animal electric fencing and make sure they don't think you are taking about the invisible...
Which side of town are you on? Pet's Barn on Dyer has electric fence I think, Lowes probably does, the feed store in Canutillo does. I'm sitting in Starbucks on Transmountain right now across from Wal Mart. I'm pretty sure North East Feeds has them too.