I went onto PayPal and sent him $321 for 3 of the 360 in-ozs last week. I went in to work this AM and they were placed on my desk about noon by staff. So I suggest going to PayPal and paying him $107 and giving him the shipping address and you will get the motor a few days later. I guess he is as busy as the rest of us but has been responsive to me. The motors appear to be a few years old (5 or 6) and are probably manufactured now by MOOG (the site is at PolySci but still MOOG). The link below has a PDF for this motor (C23-L50-W30) is my best guess. I plan to contact them to see what a 430 in-oz (C23-L55-W30) as well as what the 360 in-oz would cost new from them.
http://www.polysci.com/docs/moc23series.PDF
R