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Yes he is on eBay. He is also a member here. ajkenne, you can PM him is you want.

Yes but not recently. Lately I have been getting collars and washers from Austin Kennedy.

I think there are three sizes of #0 washers listed on their website.
The ones I linked are the narrow ones.

FWSS0 - #0 Narrow Washer S/S I.D. .062xO.D..125x Thk .017 - Micro Fasteners

http://straightrazorpalace.com/workshop/73766-nuts-bolts-washers-oh-my-microfasteners-2.html#post1198618