You have to do a little of the work yourself.

The GunsAmerica Wishlist:
Double Rifles (Misc.):
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Model Name: Project Double Rifle
Price : $650.00
Seller : THOMAS E. OPPEL
Contact : http://www.gunsamerica.com/guns/976672319.htm
Description:
577 3in. using an AYA Matador 10ga 3 1/2in shotgun as a base. Fully rifled and chambered barrels attached to monoblock by threading then welding seams. Original condition of SG was excellent showing little use. Needs to be completed w/ribs, forend lug, forend lug, front sight, and regulation. Will pay shipping to you FFL dealer. Many more pics to interested buyers.
Click this link to contact seller:
http://www.gunsamerica.com/guns/976672319.htm
(There is a photo for the listing)