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Ujuku too. He's the only seller that I have communicated with and bought directly from. Very nice, reliable and accomodating!
I have never bought directly from the other ebay sellers that MYU mentions (Soundboy_jp, jp_pens, and sakura_zeppelin) or engeika/japan_antique but I have won multiple acutions that they have posted, often scoring pens at 30-40% below lowest advertised price and have received excellent service from them all. I have not had a single problem with any of these sellers and I wouldn't hesitate to buy from them again!
Typically these pens start at $0.99. What I have noticed is that a couple of these sellers will pull the auction if a day before the closing date there have been no bids. This was particularly the case for soundboy however I notice now that he has started putting higher starting prices on his auctions which makes the bargain hunting harder but then he has had some choice pens for sale (e.g. Sesenta red and blue).