You can get them here:
2009 Honda S2000 Exhaust Pipe - Muffler, 2DR BASE KA 6MT B__02
It is #12 in the diagram.
Part number: 18310-S2A-A02 - FINISHER, EX.
$62.21
They are a direct bolt on. Just unscrew the bolt, take off the tip, put on new tip, screw bolt back on.
Note: if your car is old or goes through water/salt/winter etc, the bolt could be rusted on.. in which case you'll need to get that blow-torched off or something.
Here is a pic of mine when I had the TSX:
