I looked at older threads but I think Amazon has recently updated its rules.

Older threads say items have to be fulfilled by Amazon (like most items that qualify for Amazon Prime).

Now, it says only products sold by Amazon are eligible for the 15% off discount.

I have a bunch of items that are Amazon prime eligible but unfortunately it is not sold by Amazon. It is fulfilled by Amazon though. Bummer!

Rules are here:
http://www.amazon.com/gp/feature.html?docId=1000626061

Has anyone used the completion discount in the last few months and was able to use it on items not sold by Amazon but fulfilled by them?
I might call them to ask to double check.