There's been a few cheap DT55/65 motors on ebay recently - may be worth checking the completed listings to see if any of the buyers are possibly breaking them.
Had a heap of old Suzis breaking for spares, althoguh they appear to have seriously upgraded their website, and you'd now never know now thay had old broken engines.
Worth a call I guess.
Usual disclaimer that I'm no more than a happy customer when I was running a DT25
