That's been addressed. I could pick any 2 states where products are either different or available for sale in one and not the other. Products regulated by the CPSC or one of the other alphabet agencies.I'm questioning that the states can impact interstate commerce
Pennsylvania vs California. Things I can buy that Californians cannot; either not at all or in a very different form. Let's call the latter different programming and stickers.
Cars and pickups
Gasoline powered lawn equipment
Household cleaning chemicals
A variety of children's products
Mercury switches (thermostats, etc.)
A variety of cosmetics
Not to mention the variety of foods!
Just a sampling across a broad spectrum, the list just goes on and on and on. States requiring different specs or having different regulations or not allowing the sale of some products is as old as the country.
Some light reading:
"The Supreme Court has held that activity was commerce if it had a “substantial economic effect” on interstate commerce or if the “cumulative effect” of one act could have an effect on such commerce."
"From 1937 until 1995, the Supreme Court did not invalidate a single law on the basis of the Commerce Clause."
Not because cases were not filed, it's just really rare that it can be proven that a state law has a substantial economic impact.
Requiring different tuning and stickers is not onerous; it doesn't prevent the sale of the bike, it can be done and the seller passes the minor costs on to the consumer. Happens all the time. Things often cost more in states that have different regulations. If ebikes ever get big enough, I expect to see some states really crack down on bikes they deem illegal. There's a lot that I don't like about it, but there's that pesky 10th amendment.