High school prom can get be a really pricey affair. I know; I've footed the prom bill four times and face my fifth prom next month. Is there any way to find cute prom dresses under $100? Absolutely! Follow this guideline. To get the best prices on prom dresses, start shopping early. Familiarize yourself with styles and prices. Watch for sales. Subscribe to email coupons from favorite stores. Here are my top picks for cute inexpensive stylish prom dresses under $100. Where to Buy Great Inexpensive Prom Dresses Under $100