-Enter buy mode and enable the move_objects on code, then pick up the mailbox and erase it. Bills cannot be delivered if you do not have a mailbox. However, no one will know where you live. Visitors will appear at your house, but just stand there. You also will not be able to greet them.
-To pay your bills at no cost, tell your Sim to pay the bill as soon as he or she walks into the same room as the bill. Pause and save the game, then enable the move_objects on code. Delete your Sim, then revive him while the game is still paused. Resume the game and tell your Sim to pay the bill. The bill should be reduced to 0 Simoleons.