There are always a few that are sold on ebay, I'd say that's your best bet. The most recent 3 were between $100-$250, most seem to be variable models. The highest price I could find was for a fixed 8x56 in mint shape for $280. Make sure when you search to include completed listings to get accurate prices and include countries outside of North America.
Sometimes we get carried away thinking that the "Made in Germany" label somehow means it has to be worth several hundred $$. My intention isn't to bash your scope my friend, but I can assure you that the price I quoted is pretty accurate.
Also,again, make sure you're not confusing the B. Nickel/Marburg made scopes (older) with the newer Gerhardt Nickel scopes, they share nothing but the surname.
Perhaps they fetch a bit more here due to them being "Made in Germany", but across the pond they are not by any stretch of the imagination considered to be on par with the likes of Zeiss or Schmidt & Bender. Sorry.
And FYI, you can buy a boatload of old Zeiss Jena binoculars for around $100 ea., so the fact Mr. Nickel used to work at the factory has little bearing on optical quality of any sort, and these binocs even have the "Zeiss" name on them.