i think as clinics and doctors advance to newer and more high-tech machines (higher resolution, images in 3D, ultrasounds that detect the direction and speed of blood flow, better datalink to other computers, etc), old ones from like 1980 or something should become available. why should they keep the old ones around when they buy something newer and better and more precise? progress never stops, and these things also contain a computer that analyzes the signal and calculates an image out of it, and computers progress fast.
and to just measure and count follicles and eggs, the most basic low-res 2d machine will be totally fine.
on ebay in Germany i found one for 1000 euros and another one for auction that has two days left and right now its at 25 euros.
we could wait and see how the german auction goes: http://www.ebay.de/itm/Ultraschallge...item4acb0d811f
but then it would be more useful to track it on ebay USA. with an ebay account, you should also be able to search for past auctions.
also, question for the experts: in clinics, do these things have to be licensed for use on humans, is it a license that runs out one day or that you need to keep renewing? if, for example, there is a license making it fit for use on patients that needs to regularly be renewed and renewing it costs money, then the old ones should be even easier to get.
(BTW ive seen two breeders from the USA using them in videos, and the big german breeder Stefan Broghammer also has one).