2002 Chevy Venture, 134,000 miles

This afternoon, I was quoted a price of $268.40 for a tune-up (parts (incl. New spark plug wires) and labor by my local independent mechanic. The van is running fine, and the service is part of a regular maintenance schedule.

I don't know, but this price seems rather high to me. As it's a basic, maintenance tune-up. I know garages mark spark plug wires up an ungodly high percentage, but to the best of my recollection, I've never paid that much for this service. I know three plugs are at the back of the engine and difficult to get at, but I was thinking $150 tops.

Anyway, does this seem like about the going rate for a tune-up nowadays, or should I shop around?