I have offered the seller the equivalent of just over US$200 (N$1500 to be precise); whether the seller sees the light and comes down from the original asking price of N$7800 (~US$1057) remains to be seen. I'm not planning to negotiate. If they'll take the offered money, I'll take the camera; if not, then not. The dealer, who is selling on commission, has expressed thanks that I researched the actual value of the camera, and indicated that she's feel uncomfortable to sell at the asked price, even to anyone else, so that's a kind of relief I guess.
As for the slow shutter speeds: I use them a lot! I do a lot of low-light handheld photography, and a decaying shutter is precisely why I'm looking at alternatives to my hitherto very lovely Yashicamat 124!