Stephen Hawking - Ballpoint Pen (original available at Ebay auction link below)
Signed/ Numbered - Limited to 100 copies.  (photo above is actual artwork, prints have not been created yet at time of posting)
$50/each (shipping included)
Allow approx. 4 weeks for delivery.

Sizes

16x20" $60.00 USD

Original currently available for auction at http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=181193459227 (7 day auction starting Aug 9)