There were a number of Thor Ragnarok toys released a month or so ahead of the movie release date. The fact that you can hardly see them now in the market is proof that the tie-in merchandise for the movie sold really well. Hmmmmm...from memory, the Ragnarok toys were: a Marvel Legends set with gladiator Hulk as baf (Thor, Loki and Hela); Marvel Legends 6 inch 2 -pack (Thor and Valkyrie); 3.75 inch 2-pack (Thor and Hulk); couple of 12 inch electronic Thor and Hulk figures, those goofy 12 inch figures with limited articulation; foam hammer; electronic 1:1 scale hammer....
I suggest track down the Marvel Legends Hela figure with extra Cate Blanchett unmasked head, that one sold out quickly and remain to be a very hot figure. I have seen on message boards that it was recently re-released in other parts of the world, but without the extra Cate Blanchett head.
When Thor Ragnarok was released, there was very little in the way of toys and clothing (t-shirts). Walmart carried a Hulk figure, there were a couple of shirts on-line, etc. Compared to this, Blank Panther has been better advertised or support by Walmart and other stores.