You "can" find higher end buyers for this stuff, when I have to money on hand I buy cupro nickel lots of government liquidation. Thing is, you skip the yard because chances are they have no contract (it can take a year or two to fill even a small order) and go directly to the companies that remelt and blend these alloys. In my case I used to work at a company that casts cupro nickel wear parts and stainless alloy parts for jet engines and stuff. I have a working relationship with them, I buy all their tooling, all the wax dies and everything I can from them.
Sad to say (because yard prices are appalling) but if your going to sell cupro nickel for a contract price (about 4.70 a lb for 60/35) you will need to fulfill weight and dimension requirements, and be able to either prove the alloy by origin stamping, assay or xrf gun. This is the sort of industry normally left to scrap yards, and I used to not bother with it. Truthfully very few people are in the nickel business, most scrap yards couldn't identify nickel or it's alloys if you showed it to them. Yet another thing I learned from my ex-wife's step father...he's a scrap guru. Oh well I guess. Hope that shed some light on the situation.
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