The only thing we love more than scoring an amazing designer piece is when it's a screaming deal, to boot. That's why we love Bluefly's stellar selection of designer finds at double-take prices (up to 85% off every day). Right now, we're obsessing over pieces that take us seamlessly from summer to fall: long-sleeve minidresses perfect for fluctuating temps and luxurious snakeskin pumps that look amazing with your Tilden-tanned gams now, or with black tights once the mercury drops.Click on for our nine summer-to-fall must-haves. Best of all, Bluefly is giving one very lucky lady a $3,000 shopping spree, plus a personal styling session with Refinery29 (don't worry, if you're not in the NYC metro area, we'll Skype you in to get your fall wardrobe sorted)! To enter, sign up here between now and August 29 to receive e-mails from Bluefly and Refinery29. And make sure you share the contest via Facebook, Twitter, and e-mail — you get an additional entry for every friend who signs up!