lifts kits are fairly inexpensive til you get past the 3" mark, then they ge pretty expensive. That's because in order to lift a couple inches you don't have to replace that much, but when you get taller, you have to replace most of the suspension system. Take care-the higher suspensions on the off road vehicles are treacherous. A lot more prone to tipping and floating. The steering is generally less responsive, and the transmission has to work harder than it was ever made for.
Clearance gained is only as much as the larger tires, because the axles will still be the same height. Better to install a reinforced custom skid plate, put air shocks, or heavy duty shocks all around and get the best tires (75's) you can afford.
http://www.4x4groupbuy.com/store/suspension-lift-kits-shocks-suspension-lift-kits-c-75_4.html?gclid=CO68sryR5JcCFQpuGgodkW4RCg
http://zoneoffroad.com/product_menu?ct=1&mk=6&gclid=CKjg3qeU5JcCFQEoGgodBjXbDg