DiMeCard 8 microSD Card Holder : ID 3664 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Team BlackSheep Online Store - ETHIX SD Card Holder
JJC Portable MicroSD Card Case & USB 3.0 Card Reader Anti-drop Credit Card Size Memory Card Holder for 2 SD + 4 Micro SD/TF Card
Amazon.com: Memory Card Case - Fits up to 22x SD, SDHC, Micro SD, Mini SD and 4X CF - Holder with 22 Slots - Microfiber Cleaning Cloth Included : Electronics