I've also purchased 3/16" from Sherrill's for basically the same price as found on ebay(and the shipping is less). But I've not seen any 13/64" in Sherrill's before.
I have bought tons of files and bars from Jeff and he is tops. Not to mention how many people he has sent to this site. Give him a try and you will be satisfied.
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Try buying "Husqvarna" labelled six packs of files...they are made by Pferd. Or if you want the blue boxes...I can set you up.
Oregon, Jonsered, Duramax, (among other I presume as well) are all made by Vallorbe out of Switzerland...and are typically what most of my users file with.