@pleonasm - It can end up being more than a few dollars, particularly if you pick the wrong travel agent and they add on a lot of extra fees. You really have to make sure they are being transparent by doing your own research on top of theirs. It doesn't take very long to look up fares online, as well as tours and other prices.
An agent can be a lifesaver, but they can also cost you a lot more than you need to pay. Their job should be to get you the best trip within your budget.