I attempted to sell mine for four keys. The trade was up for three days with little to no offers, let alone at 4 keys. Granted, by sheer luck I sold it for four Fall keys a few hours ago, but before that I was getting offers of 2-3 keys only.

I also put mine up for 4 keys and no luck selling it at that price, but got many 3 keys offers. I think this is a good current price.

agreed. Festive scattergun is the most popular festive weapon and is in the most demand. Three keys is more than fair and it will certainly be more as the holiday season approaches.