Samsonite via eBay offers the Samsonite Delegate 3.1 Attache in Gunmetal for $69.99. Coupon code "JETSETTER" cuts that to $55.99. With free shipping, that's the lowest price we could find by $53. It measures 18" x 14" x 4", accommodates laptops up to 17", and features a combination lock and a divided organization panel. Deal ends November 6.
Note: The above coupon can be used three times per eBay account.
You very likely are putting your laptop battery into an early grave.