Absolutely! My step-father goes to the Honda dealer even to replace a burnt tail-light bulb. I bet he pays 40 bucks! I wouldn’t write off a shop just because it’s a chain, however. I used to go to the local K-Mart, where there was a very crusty but knowledgeable guy who dissed me severely for owning a foreign car, but often didn’t charge me anything for tightening a belt and such.
With this car, the question is what is involved in changing out the plugs. I find it hard to believe that on a modern car accessing the plugs would require major dissasembly or unmounting the motor. Ask your local independant (or at least non-dealer) shop. Also, plugs and wires last a good long time. No reason to replace them if the car is running fine.