If you are looking for fancy dress costumes, you are going to want to wait to purchase until after Halloween. I know it sounds weird, but the best prices on fancy dress costumes are had after halloween. The problem with purchasing your fancy dress costume during the peak season is that retailers tend to increase prices due to an increase in demand. You need to purchase your fancy dress costumes when the demand is at its lowest. This will guarantee you the best price on your fancy dress costume. Next time you purchase a costume, remember to plan ahead to save money.