This charger from HobbyKing is about half the price when you factor in shipping weight, and also charges at 6 amps. I have one for charging Li-Po batteries at home, but I brought it to a competition, and it works great for FRC batteries.
http://www.hobbyking.com/hobbyking/s...cessories.html
Keep in mind for either one you will still need to find a power supply. Laptop chargers as long as they are >6A and 12V and ATX power supplies both work great.