NYCgarages.com: Search and compare all Parking Garage Rates in Manhattan.
This site is the brainchild of Benjamin Sann. He started the project when he was 16 (he’s now 18). He collected the data by biking every block to collect rates and precise locations twice: once for the initial entry, the second time months later to verify.
RESPECT! (and thank you!)
(via Charlie Susiman’s fabulous Manhattan User’s Guide)