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Thanks for all the replies. I ended up at the dealer which cost $60. I thought they would cost over $100 that's why posted. I didn't think crappy tire sold them or I would have bought them.
You can find them at a lot of places, surprisingly. When I busted one accidentally while replacing my spark plugs, I managed to find one at Advance Auto. They were a few dollars higher than Rock Auto, but I needed it that weekend so I could get to work on Monday.
Turned out that the centre electrode was burnt off the spark plug which caused the coil malfunction.
The cheapest supplier was Benson at $32.
However my truck is throwing a poor ground error for the fuel pump (from time to time to this winter) which may have caused the centre electrode to burn off.