SheIn offers its SheIn Women's Striped Retro Cardigan in Multicolor for $16.14. Coupon code "NEWSLETTER3" cuts it to $13.14. With free shipping, that's $12 off list and the lowest total price we could find. It's available in sizes S to XL.
Note: Be sure to uncheck the shipping insurance box; otherwise, it adds 99 cents. This item ships from mainland China and should arrive in three to four weeks.