as been discussed....Nothing magical occurred in the last 60 days, GM is trying to move product off during Q4 with 25% off MSRP for the 3rd year in a row now. This naturally pushes older models lower in resale value.
Low mileage 5th gen 1LE with recaros is still worth 30-31k, good luck with that one.
'14-15 2SS target is $27-28k + TTL @ retail and $24-25k private sale or trade in.
Camaro still has one of the highest resale values on the market.