At first I always said tax was included in the price. I just got a portable cash register so now I am going to charge it and will give all a recipt. I have a show this weekend and will let you know how it goes.
I have done about 10 shows so far and have yet to take a bad check. I ask for the phone number and let it go at that. Knock on wood.
If you are even thinking about taking credit cards a good place to start is
www.propay.com If you do not do a high volume of cards they are about the cheapest. I accept them and would never go back to not taking them again. I bought a manual imprinter with slips on ebay for about $20.
Good luck and hope all goes well for you!
Bruce