2007 Chevy HHR Front end clunking

My front end clunks when I hit the slightest bump or uneven pavement. I have been told that this is a sway bar bushing by an auto repair shop and that it is the lower control arm bushing by the dealership. The dealership said that this is just a guess because that is what those noises most commonly are. I want to just buy the part and have it repaired somewhere else so is there any way of knowing for sure which bushing it is? I don't want to have to replace ten different ones at 50 dollars a piece before we get to the culprit.