Shop Sierra Trading Post for 25-85% off dresses, skorts and skirts. The pictured SmartWool Fern Lake Dress, originally $95, is now $28. And check out the Chiffon Layered Dress, once $138, now $19.99. These are the lowest prices we could find. Shipping starts at $5.95 and increases with order amount. Sales tax is charged in most states.