They usually don't go for too much more than any other Mod. 94 that is in good condition -- $400-600 or so. They made so many of the various gold-plated commemorative editions over the years that they are really not a rare commodity. They cranked them out like hotcakes and as soon as they finished the "limited" run of 300-500 rifles in one version, they were already cranking out another one. That is why I chose to shoot the Oklahoma Cowboy Hall of Fame commemorative edition I have, which my grandpa gave me. And I am glad I did -- it is a great shooter, and I will get a lot more enjoyment from shooting it with my future offspring than I ever would from keeping it as a wall hanger.
Go on armslist, gunbroker, gunsamerica, and auctionarms and you will find plenty of commemoratives for sale.
Now if you want a real antique rifle, like a 1930s model, that is going to cost you. It is an ACTUAL collector's item unlike the commemoratives which tried to artificially create an aura of rarity.
Also there was never a Win. 94 with a brass receiver... they have always been steel. Some of the early ones (and commemorative editions) had a brass butt-plate and other parts though.