Priceline
Last weekend we found some decent fares to San Fransisco for a quick weekend trip and opted to book them before they went away. Since public transportation options from SFO into the city seem to be a bit lacking I decided I'd look into a car rental.
Price comparisons at all of the big rental companies returned rates in the range of $54 to $70 for a single day. Rarely do we rent cars but those price quotes just didn't seem reasonable. Enter Priceline.
I've toyed with the online booking service before, mainly while looking for hotels and such, though never used it fearing I'd end up at a hotel of deplorable location or condition. Priceline'ing a car rental would seem to entail less risk and so I figured I'd give it a try.
I placed an offer of $16.00 (before all taxes, fees, etc.) and it was accepted. The grand total, all in, coming out to $34. Not bad, I say.