Typically, a 3rd Gen Toyota 4Runner lift kit costs somewhere in the ballpark of $700 to $1,100 (before taxes/shipping), but prices can range into the $1,500+ territory—it all depends on the contents of the kit and the quality of the parts.
Most 3rd Gen 4Runner lift kits, however, will contain front and rear coil springs, adjustable struts, rear shocks, and their associated accessory parts—the amount you’re charged after the fact is primarily influenced by how strong, durable, and resistant to shock the parts actually are.