MilitaryCAC's Places to purchase / information about / drivers for USB CAC readers
Tx Systems SCR3310 v2 Card Reader (CAC-Approved) - Walmart.com
New SCM Microsystems USB CAC Smart Card Reader SCR3310 Electronic | eBay
SCR3310v2.0 USB Smart Card Reader Drivers, Downloads, Support | Identiv
windows 7 - Smart Card errors - Super User
SCR3310v2.0 USB Smart Card ReaderFAST AND CONVENIENT- Shorten your transaction time with a reader that's optimized for speed. It's ultra-compact.., By Identiv - Walmart.com
Download and install SCM Microsystems Inc. SCR3340 - ExpressCard54 Smart Card Reader - driver id 31889
New SCM Microsystems USB CAC Smart Card Reader SCR3310 Electronic | eBay