Again, trying to guage the market right now is kind of screwy, but the last one I bought was Spring of 2011: an early 80s HK91 with ALL the factory packaging, test target, steel and aluminum mags, bipod, claw mount, and factory (fixed) stock. If memory serves it was about $2500 or so. The day the first import ban was passed they went from the mid to high hundreds to about $2500 overnight and have seemed to hover there for the past 25+yrs or so. During times of greatest panic they may shift a little, but long-term I think $2-2.5k seems to have been the going price on the 91s.
Can I tell you how many times I've kicked myself for passing on the SP89 for about 800 bucks many years ago because I just couldn't at the time figure out where the "value" in it would be long-term? URRRRRRRRRRRRRRRRRRRRRRRRRRRGGGGGGGGGGHHHHHHHHH
Congrats on that 94 you've got. I'm hoping you are trading for something REALLY REALLY serious if THAT thing is in the mix. Monetary value aside, that' just one you're gonna kick yourself for dumping unless you are getting something RIDICULOUSLY cool to replace it. Not just expensive, not just neat, or "top of the line" but seriously seriously COOOL to replace it. Just don't get hosed on the trade, no matter how bad the economy there always seem to be those of us that will spend money we don't have on cool shit, so before you let someone beat you up in a trade deal offer it up for sale, someone will scoop up that 94 as a host.
Best of luck with the deal, and if it goes through please let me know what it was that was worth both of those rifles so I can drool over THAT!!!