Amazon.com : Bestom 50 Pack Hard Plastic Horizontal Badge Holder, Id Card Holder, Frosted Clear Id Badge Holder, Id Holders for Badges, Name Tag Badge Protector Case W/Thumb Notch and Slot &
Leather Badge Holder
Rigid Open-Faced 2 Card Holder (P/N SPID-150) and more Rigid Plastic Holders at SpecialistID.com
For 1 card - GMH CI
Amazon.com : Badge Holder, Arae PU Leather Horizontal ID Badge Card Holder with Detachable Lanyard/Strap - Wine red : Office Products
ID card badge holder in credit card size - karteo.com