The parts are nothing. Bushings for the shocks are probably 20-30 bucks but guessing by the layman mechanic comment you're taking it to a shop which would be the biggest cost. For me, pulling the front shocks is one of the bigger pain in the ass jobs i hate doing. Before you dive in, have someone jump on the bumper while it's parked and see if you can trace the noise while you're underneath. If you find it, spray with WD40 and see if that stops it for 10 seconds. Least then you'll know for sure what you have to change.
Land Rovers are by far the best looking 4x4 on the back of a flatbed...