Burlingame Airport Parking tends to be a little over $10/day all-in. Downside is the shuttle (shared with Hilton) only runs every 30 min or so. I come in from the north, so it's also a longer drive than Park SFO, which is what I usually use.

Never tried LTP before, but with the FLASH20 code for an upcoming 6 day stay it's pricing out at $86 all-in which is better than Park SFO even with the 2-day free coupon, which is ~$80 + tax. What is the tax at ParkSFO...9%, 10%?

[edit]: Actually, if tax is 9% and ParkSFO doesn't tax free days (do they?) then it's on par with LTP.