$272 for 6 coilpacks at Suncoast. Just bought some to go with my next plug change.

 

yep. Change them both.
I'm based in the uk but you will be better off using a us parts supplier such as pelican parts or sunset autos.
I paid about £30 for each coil pack.
The bosch ones are a new product and i've fitted them myself and i'm impressed so far.

 

opps sorry did not know it was misfiring on only 1 cyc. good luck steve