Last night, while looking for additional decorations at a local "dollar store" my wife and I chanced upon these packs of undersea diorama pieces. It is unusual enough to find packs of nothing but dio parts, let alone from a "dollar store", so I grabbed all 6 packs that they had.
The large coral comes in 2 different colors (milky pink and solid green) and are the best pieces in the sets. The smaller orange coral pieces are also desirable. The various green plants are useful to different degrees but the rocks are hollow blow molded crap that went straight into the trash.
Large coral color variants:
with a 3.75" figure for scale:
Not a bad dio fodder score and the large coral pieces alone were worth the $1.29/pack price.