If they don't voluntarily offer you compensation, your only recourse is to file a lawsuit. You could absolutely sue them in the state in which they are organized or registered; if they regularly sell in your state, you can most likely file the lawsuit in your own courts, since regular and predictable economic contacts are usually enough to confer "long-arm" "personal jurisdiction" over a business (basically, if you intentionally take advantage of selling/making money in a state, the trade-off is you subject yourself to that state's court's jurisdiction)--though even if you can file in your state, you'd have to serve the legal papers on them where they are located, which can be modestly expensive.Filing and bringing a lawsuit is no trivial matter; even if you are your own attorney, there are some expenses (like service of the papers) you have to bear yourself, and you will spend hours, possibly days, on this. Think carefully about whether it is worth doing this. (And if you hire your own attorney, you have to pay for your own lawyer--the other side does not pay--meaning that it's only worthwhile if you could legitimately sue for $10,000 or more dollars in most cases).