Lenovo is offering this Ideapad 13" Notebook Sleeve for $7 (plus tax) when using promo code: USPC11M16318 (expires March 7, 2011).  

http://bit.ly/hQsdbE

Outer Specs:
Approximate height: 26 cm (10.24 in)
Approximate width: 36 cm (14.17 in)
Approximate depth: 1.5cm (0.59 in)
Approximate weight: 0.22 kg (0.48 lbs)