G nocks for my Easton A/C/C's run around .90 cents apiece... I replace them several times per year, and carry extras on my when I'm at 3d shoots as well as in my field pack. I just replaced all of them on my arrows last night in preparation for my elk hunt, and may do so again if I notice any that are loose before I head out in 30 days.

The moment of truth is not the time to discover a loose nock that won't hold onto your string that well.