Spirit Halloween and Disguise were the two companies that made official costumes. There are both adult and children's versions of the costumes, but I only listed the adult versions.
If you're shopping for loose Figma action figures look closely at the listing's pictures. A lot of sellers incorrectly identify the Hasbro action figures as Figmas (sometimes they also do it vice versa). Figma's have ball hinge joints, while Hasbros ...
Also, I hate Funko figurines, so I'm not listing them.