State laws on firearm and magazine shipments come to mind.
I have some knowledge in this area, guns being one of my many hobbies.
Let me give you a few examples.
First, Federal law trumps state laws.
So, if you're shipping a firearm across state lines, it must ship to someone with an FFL (Federal Firearms License).
The FFL does a background check on the purchaser before releasing the firearm.
Where state law come into play is if the firearm isn't state "compliant", the FFL will not release it to the purchaser and it will go back to the seller. Rather than put up with the hassle of misunderstandings, many sellers won't ship to certain states, but they can.
The state isn't regulating the business in the other state, the state is regulating what the citizen of their own state can legally purchase.
Again, the analogy with sales tax is that the state should be enforcing collection of sales tax against the citizens of their own states, not asking the court for permission to force businesses in other states to comply with their laws and collect taxes on their behalf.
In the gun analogy it would be like California, which bans certain types/models of guns, to force manufacturers in other states to stop manufacturing them because they aren't allowed in California. In other words, forcing them to comply with California law.