Laws do vary anymore, but in the pre-Internet mail-order days, a company could only charge state taxes if they had an outlet in that state.
For example, mail order JCPenny could charge taxes on an order if they had at least one JCPenny retail store in that state. Otherwise, they (and the purchaser) could avoid paying state tax where the purchaser lived if JCPenny had no retail outlet in the purchaser's state.
This was a great incentive for mail order companies and their out of state customers.
Oh! Ok. We do have several in this state. Thanks for clarifying that for me Tom!
The mail-order taxation regulations you referred to also apply to internet transactions. As a Florida based business, with no physical presence in other states, I am liable for sales taxes only on sales within FL. Supreme Court ruling supports this; (Quill Corp v North dakota).