Mego 1981 Price Sheet

It's interesting to note that Buck Rogers was in it's third year with Mego, this makes it the most successful post Star Wars line Mego carried. By 1981 however, the 12" line had been dropped.

WGSH Assortment 51308 consisted of Shazam, Batman, Superman, Robin, Captain America, Hulk and Spiderman. Penguin and Joker were dropped from the 1980 assortment (although Shazam is featured in catalog pages, it's possible that he was soon dropped from the assortment as you cannot order solid cases of him.)
The Dallas Action Figures Were not produced, pics are available at the link