Select prom dresses are $99 or less at Macys.com. Plus, enter code TICKET for an extra 15% off. The pictured Speechless Strapless Gown drops from $99 to $79.99 to $67.99, while the Trixxi Cap Sleeve Tulle Dress falls from $99 to $84.15. Shipping is $9.95 or free on orders over $100, so you may want to pad your order with jewelry or accessories. Please note that Macy's accepts in-store returns on all online purchases, in case there are fit issues with the dress. Sales tax is charged in most states.