Are there any other charges incurred with purchasing tickets (taxes, shipping), and what are those charges ?

All additional charges are the same as regular ticket. It is a regular ticket, just discounted. If you need to see the statutory charges that TicketMaster or TeleCharge make, go to their web sites and attempt to make a sale, their additional charges will be outlined. (Don't actually put the sale through, though, unless you really want them.) There is no tax on Broadway show tickets. If you are getting the tickets sent to your address, they will charge for that service. If you pick up the tickets at the theatre, there will be no shipping charges.