I found the Targus reader at Walmart and it can be purchased online for $8.88. At last a card reader that works with the N810.

Targus TGR-SD20 SDHC reader
http://www.walmart.com/catalog/produ...uct_id=9722060

This cable has been mentioned before and indeed it worked well for me. Both the reader and an appropriate cable are required to read SD cards on the N810.

Cable - microUSB to Female USB A. Automaticaly sets the USB to OTG.
http://search.digikey.com/scripts/Dk...name=H11576-ND