I recently made a wedding cake for a couple who worked at Starbucks and they got a chocolate liqueuer that I mixed and used as a filling for the cake. Have never dealt with a chocolate extract. Good Luck!! 
it seems like it is a specialty product. you can get it on amazon.com, but if you need it asap, you'll have to pay lots of shipping.
http://www.countrykitchensa.com/catalog/product.aspx?T=1&productId=1832
Here's 2 oz of chocolate flavoring for 3.70 plus shipping. I know it sounds expensive but it goes a long way!
Here is concentrated oil/flavor.
http://www.countrykitchensa.com/catalog/product.aspx?T=1&productId=1871
Can you use chocolate liquor? I got a mini bottle of Godiva in our local liquor store, i was less than $2.
Well That is the thing I won't go to the liquor store. No need to explain but I just wont.
Any other ideas. That is the brand the receipe calls for but there is always a substitute...right????
Surfas restaurant supply has 8 ounces for 9.85 plus shipping. https://www.surfasonline.com/products/19360.cfm
They also have great prices on Neilsen-Massey vanilla in bulk as well as other ingredients and plastic storage for flour, sugar, etc. They ship pretty quickly. Hope this helps!
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