In a rather literal interpretation of BOGOF, 1minime.com is offering a free duplicate of your custom bobblehead.
From email,
Purchase a doll on our web site at www.1minime.com during the month of May and receive a free identical copy of your order! Simply enter the following voucher code during the last step of the ordering process: freecopypromo
So that's the same head, on the same body. From their checkout buying a duplicate normally costs $49.90
Awesome if you have an evil twin or two heads, otherwise you might need a get a little creative to get the most of out it. (Bookends? Bobble gargoyles for the front gate?)
I've used these guys before and wasn't greatly impressed with how it came out. They only give you one chance to edit your image and mine started out looking nothing like me and even with all my comments it ended up looking nothing like me. The Fiancee's bobblehead looked closer to her but stil not very accurate (even cartoonish looking) but at least you can look at hers and say 'yes that's her'. Mine you can't.
Also you pay extra to make it bobble.. how do you sell bobbleheads by default that don't bobble?