This box from lowes is a 10 acre box and I believe the guy said it was only 22 bucks lol. I have only seen them come in mileage category as far as how much it covers. I'm wondering if this is a legitimate box for that price?
Fi-Shock makes a lot of fence chargers. I've never had one, but would stay away from anything labeled 'Light Duty' in my pasture IMHO. An extra $25 or so will get you a charger that should last for many years.