> Ebay, Amazon, and flea markets are all secondary markets and thus don't require sales
> tax, correct? Ebay and Amazon already require you to pay taxes if you are a business.
> If I set up a table at a flea market I wouldn't expect to have to pay taxes.
Again, it depends on the way the state sales tax laws are written. The original Supreme Court cases focused on the seller's presence within the state. If the seller had a physical presence within the state, yes collect online sales tax. No presence, then no. The recent decision overturned this focus of seller's physical presence.
I HOPE states will EXEMPT individual, non-business sellers from collecting sales taxes. But the S.C. cases don't explicitly bar states from requiring individuals from collecting sales tax on their individual online sales.
Here's another food for thought--the sales proceeds from items sold on secondary markets are technically taxable income to the seller and should be included in their personal income tax return as "Hobby Income." Now, the recent South Dakota v. Wayfair decision could pave the way for taxes on all online sales.
Add: by definition, a flea market is a physical location with physical buyer-seller transactions. We're not talking about these sales because they are conducted OFFLINE.