Where can i find the loest airfair to vegas?

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My friend (the fist one to marry) is getting married and she wants all her best friends to go with her to Las Vegas, for her bachelorette's party, because she's moving to Boston (we live in Mexico) after the honey moon, and we are not going to be together for a pretty long time. And we want to have some kind of only girls trip to remember good times. And we promised that the first one to get married wed all get together and go to Las VEGAS, in the summer. Here's the problem we are broke we are students and have no big money to spend... and Airplane tickets are very expensive... does anybody know how or were I can get cheaper rates.