WTD - 40-track (360K) 5.25in floppy drive

Hi guys, I'm trying to get my hands on a 5.25in double-sided 40 tracks per side "360K" floppy drive with the Shugart or IBM PC 34-pin connector (either edge connector or pin header is fine). Does anyone have a spare they'd like to part with? Slight preference for Teac or Mitsubishi, but anything will do at this point. I've checked Ebay, there are tons in the US (complete with "seller does not ship internationally, don't even ask"), but the only ones I've seen from UK sellers are parts scalpers wanting stupid money for them (?149 "sold untested with no guarantee"? really?). A BBC Micro 40-track drive would also be fine -- as long as it's native 40-track, not 40/80 track switchable or double-stepping (an 80-track drive mated to a PCB which double-steps the head). Cumana, Viglen and a few other companies made these, they were extremely common a few years ago. I'm on the verge of getting DiscFerret write support working (at least for UNIX PC disks) but the sodding thing won't read anything my 80-track drives have written! I'd rather not borrow the 3B1's drive - the DiscFerret is experimental and a benchtop lashup is hardly an ideal scenario.