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Having bought one (and it being our preferred colour) we've been on the lookout, and there are very few on the road.
It's not offered in the MY15 Redline.
2014 plated low mileage VF Redline Sedan's are currently making low $40's at the Holden Auction. I would say your changeover will be circa $20k. If your car is Regal Peacock, add $3k to that (every dealer will punish that colour greatly).
It's just one of 'those' colours.... Alchemy is another one. Sizzle was one in VE. There's always a colour in the range that really struggles used. Vespers in VY/VZ.
Across the board Regal cars are making $3-4k less at the Holden auction. Black wheeled redlines are making a heap more than chrome wheeled MY14 redlines also.