https://www.sos.mo.gov/BusinessEntit...orp.asp?546084
If this link works, it shows that Expedia is registered to do business in Missouri. You can check this sort of thing online easily with most states. Got to your state's Secretary of State website and look for the search engine for business entities.
If you file suite against the entity, serve them at the registered agent given by this search.
Anyone with any specific questions can PM me.
If you try this route it's true some of you may get nothing. Some may win judgments, some may get settlement offers from the entity on the grounds it's cheaper to settle than to defend.