I compared the H-D filter to the Mobil-1 filter I use on my truck ( made by champion labs ) and they are exactly the same except for the thread diameter. Mobil-1 filters use the synthetic filter material, like the H-D superpremium filters, and filter down to 10 microns. I believe that champion labs make the K&N filter, probably the H-D filter. I do not think that you will be able to find a synthetic media oil filter that filters to 10 microns for less than the H-D filter, the Mobil-1 cost me about $12 and the H-D cost about $8.50.
I don't know your dimentions that you have to work with, but for me I found that the good old Fram PH8A fits. So, I use the K&N equivalent (HP 3001). It is a tight fit, but it works. Of course, there is not a non HD oil filter that is made for my bike.