Target offers this Retro Plaid Twin XL Duvet Cover Set for $37.50 with free shipping. That's $12 off list and the lowest total price we could find. This set includes a duvet cover and pillow sham. Deal ends February 13.

Note: It's also available in full/queen for $45 or king for $52.50 with free shipping. They're $15 and $17 off, respectively, and also price lows.