AGFA 3-Piece Professional Filter Kit 49mm for $12

The AGFA 3-Piece Professional Filter Kit 49mm (UV, CPL, Warming) is currently on sale for $12 by a 3rd-party seller with the order fulfilled by Amazon so you get free 2-day shipping if you are a Prime member (or with a $35+ order if not). This is part of a line of 10 different filter sizes, and as a group, they average 4.4 out of 5 based on 400+ customer reviews. Of those, there are 17 customer reviews [filtered review results] on the 49mm model (but it doesn’t average them).