Looking for Good Prices on Engagement Rings

My girlfriend and I have been talking about getting married a bit lately. We have known for a while that we would but have just not gotten around to making it official. One of the reasons was that I wanted to give her a nice ring and have not had the money to buy one. I have been saving and am now looking for good prices on engagement rings. I want to make sure to get the most for the money that I have saved. I think I have a pretty good idea of what my girlfriend would like and now I just need to find it in my price range.