Damaged pedal threads on crank arms, having a hard time finding a replacement, what do I do?
You might be able to rescue the threads in the current crank with a thread tap.  Running the correct size back through the damaged threads might clean them up enough to work.
Failing that your LBS should be able to give you a price to Helicoil them.  Basically they increase the size of the hole and stick an insert in for the pedals to screw into.