Aeropostale offers its Aeropostale Women's Curvy Skinny Jeans in Medium Wash for $16. Coupon code "FACTORY30" cuts it to $11.20. With $7 for shipping, that's $28 off list and the lowest total price we could find. They're available in sizes from 0S to 000L.
Orders placed by December 21 are guaranteed to arrive by Christmas.