We have set up a quantity discount to purchase 3 of these at a discount of $5 off each bracket. Normal price is $25.00 each. But if you purchase 3 at one time the price will be $60.00 for any combination of 3. (.090 steel, .125 steel and .120 aluminum). The ISIS systems typically are sold with 1 master cell and 2 power cells so purchasing 3 brackets make perfect sense for your project.