Sometimes the free apartment locaters are good if you don't have a lot of time, but you will have to bullshit. Of the 5 times I've gone to a locater, 1 has been useful, 3 have been jerks, and 1 wasn't helpful but saved me about $300 when I listed him as my agent.
I think the best way is to drive around where you want to live, and whenever you see an apartment, have someone write it down or voice record it. Later look them up and call for information. Use the process of elimination, and visit the best choices. There are also some websites that allow users to rate apartments but I don't remember what they are.
When visiting an apartment and they are bullshiting you, just ask for a copy of the lease and/or application and tell them you need to compare some more. If they are telling you the line about the "look and lease" discount, run away. It's usually a trap.