Both NAPA and Checker are equal distance from me. Instead of saying they're "close by", I'll just say they're "close enough".
I did call Checker and they quoted me about $50 each and 2-3 weeks out on availability. That's when I noticed the ad in the spring 2004 LMC catalog: all four cylinders for $70.
I'll give NAPA a call.
Husker