This tip is just for locals. I live south of market (soma) here in San Francisco. My auto registration was due for renewal, and I needed to get a smog test. Most testing centers in the area charge $60-$80 for the test. But, there is an auto repair place on Russ St., called T-H Auto that does it for less. Their base price is $39.95. There’s also an $8.25 certificate charge, and $3 electronic filing charge, bringing the total up to $51.20… but you’ll still end up at less than the other guys.