your drive belts should be replaced every 60,000 miles, and only costs about $20.00, and takes two seconds to do so there should be no labor charged, hes ripping you off if thats what you need. Your Timing belt is supposed to be changed at 120,000 and will destroy your engine if it breaks, so get it done, not a day past the 120k. Timing belt will run you between $500 and $1200 depending on if you go to a small shop or the dealership. Im thinking thats what he told you to change due to the price quote.