On September 29, 2014, the NASA Planetary Data System announced the third release of LRO Mini-RF Bistatic Radar observations, including data acquired on March 12 and March 14, 2013 (orbits 16938 and 16963). To access the above data, please visit this link:
http://pds.nasa.gov/subscription_service/SS-20140929.html

PDS offers two services for searching the LRO archives:

The Planetary Image Atlas at the Imaging Node allows selection of LRO data by specific search criteria:
http://pds-imaging.jpl.nasa.gov/search/lro/

The Lunar Orbital Data Explorer at the Geosciences Node allows searching and downloading of LRO data and other lunar orbital data sets (Clementine and Lunar Prospector):
http://ode.rsl.wustl.edu/moon/