More than fair, I gave 150 USD for one missing remote, body, and more.
I would lay down $100 on the counter for it and if the shop worker just won't budge from $120, buy it still. What are your plans for it? If you are going to keep it and go through it to get it ready to run, then I strongly urge you to buy it, as the value is there. However, If you were planning for a quick profit reselling, I would pass.