MilitaryCAC's Places to purchase / information about / drivers for USB CAC readers
SCR3310 v2.0 Identiv USB type A SmartCard reader ideal for Driver card reader / CAC reader / ID card reader| | - AliExpress
Identiv uTrust 2700 R Contact Smart Card Reader
SCM SCR333 3.5" Bay Internal USB Smart Card Reader | CardLogix
SCR331/SCR3310 Drivers, Downloads, Support | Identiv
Amazon.com: Type C CAC Reader Saicoo DOD Military USB-C Common Access Smart Card Reader, Compatible with Windows (32/64bit) XP/Vista/ 7/8/10, Mac OS X : Electronics
Identiv SCR3310v2.0 USB Smart Card Reader SCR3310V2.0 B&H Photo