people always want to save money ,so it is a good idea not to spend too much money on anything unnecessary.so a cheap evening dress is necessary for you .however ,there are several important issues that you need to check out before buying cheap evening dresses.such as quality ,design.while you can go online and look for big discount and offers.in general,online deals are always cheaper than the offline ones.so you needn't worry about the dress's quality or thers.you can also invite your friends with you together.