I think 13 states already make eBay collect sales taxes on their behalf. Well a few more join that list effective 10/1/19 and then another round will be effective 1/1/20. If your state isn’t already collecting sale tax from online transactions, definitely check. eBay has a nice list already put together.
10/1/19
California, North Dakota, South Carolina, Texas, Maine, Maryland, Arizona, Colorado, Massachusetts, and Utah.
1/1/20
Illinois, Hawaii, and Wisconsin