So in my quest to figure out if I wanted to bid on an auction for a used bag where the seller was charging sales tax, I stumbled upon this site that had some great info on it and thought I'd share:
http://www.newlifeauctions.com/ebaytaxes.html
"Selling Personal Items
Many new eBay sellers wonder if they need to pay taxes on the items they sell. The answer is yes, but only if there is a profit on the sale. Since most used items sell for less than what they cost new, there is no profit on the sale. If there are no profits, then there is no need to pay taxes."
http://www.newlifeauctions.com/ebaytaxes.html
"Selling Personal Items
Many new eBay sellers wonder if they need to pay taxes on the items they sell. The answer is yes, but only if there is a profit on the sale. Since most used items sell for less than what they cost new, there is no profit on the sale. If there are no profits, then there is no need to pay taxes."