Saw this posted on another forum. I don't know how long it is good for.
Adorama offers the Lowepro 350 Backpack for DSLR Camera and 17" Laptop in Black, model no. LP35194-PEU, for $124.95.
Coupon code "S7654321" cuts it to $75. With free shipping, that's the lowest total price we could find by $38. It designed to hold one digital SLR with a zoom lens attached plus a 17" widescreen notebook, and more.
LP35197PEU Lowepro Fastpack 350 Digital SLR & Widescreen Notebook Backpack, Water Resistant & 180-Degree Access Panel, Black <--- Adorama link from this forum.
I bought one of these when they first came out and it is a great product. I use the laptop section for holding papers and other flat things (foam flash modifiers) more than I do my laptop.
Tim