Original eyelevel prism from Nikon F will also fit on F2. I was also looking long for it, on the end I have found one Nikon F with eyelevel prism on ebay.de, so around 100€ or so.
What I have noticed that often on German site they spell wrong: photomic, photonic, Nicon, and so on...look for those as well in "analog kameras"
The one I got for 95€, I was the only bidder, it was written wrongly as FX digital camera, no mention of the eyelevel prism (that is expensive):