Plastic Disposable Plates

Hi guys! Wedding is in 3 weeks! I am so excited but still have a couple things to do. One of them is table wear! My fiance and I are very casual people. We are having a rustic wedding and don't want to deal with the cleanup or cost of glass plates. We are going with hard plastic disposable plates. Have any of you done this? If so, do you have any suggestions where we can get the best bang for our buck? We are wanting just solid white ones that are heavy duty. We have a guest list of 120. Thanks!