We really need a little more details.
What type of camera, how will they be using it, is size a consideration, what other features do they desire (HSS, Optical Slave) etc? Most of the flashes you'll come across offer e-TTl (auto) as well as manual settings at your price range. I'm going to assume it is a Canon brand.
Just to throw something out. If a Bridge camera or desiring something portable, then consider a Canon 270ex II or even Canon 320ex. If DSLR camera then consider Metz 48af-1, 50af-1, IMHO. Those are very easy to setup, quite affordable and high quality. Others will recommend Canon 430ex II but the Metz mentioned come with more features at a lesser cost. If they want a professional grade flash with every feature imaginable then consider Metz 58af-1 or 58af-2, otherwise Canon 580ex II.
Yongnuo also makes some nice flashes, though not on the same level as those mentioned above but typically cost less.
You can go HERE for good details and comparisons.