Lost, is on the money there, there are heaps of aftermarket parts available for stihl saws.
I just got an after market coil for my ms261 for $21 just to throw in the gear bag, OEM is $50 Via the US and a whopping $145AUD locally!!!
with the older ones that have a separate coil/CDI unit you can even get replacemnts that are integrated,
and when you replace it just place a Playing card / business card between the flywheel and the ignition , nip up the screws and remove the card.