MilitaryCAC's Places to purchase / information about / drivers for USB CAC readers
Manhattan Smart Card reader, USB (102049)
Amazon.com: IOGEAR USB-C Common Access CAC Smart Card Reader - DOD - Government - Healthcare - TAA Compliant - Support for V7.x n V8. USAccess Personal Identity Verification (PIV) - Mac OS -
Smart Card Reader USB Gemalto IDBridge CT30 ID Tacho CAC Military eID Tachodisc Identity Health : Amazon.co.uk: Computers & Accessories
Amazon.com: VOASTEK Smart Card Reader USB C, CAC Card Reader with 3 Slots SD/Micro SD Memory Card Reader Compatible with Mac, MacBook Pro, Chromebook and Other Type C Laptops : Electronics
SCR3310v2.0 USB Smart Card Reader Drivers, Downloads, Support | Identiv
+ID smart card reader USB - Smartcard readers - Nordic Digital
Identiv SCR3500A SmartFold USB Smart Card Reader | CardLogix Corp
Amazon.com: USB Smart Card Reader ACS ACR39U : Electronics