Green House is going to release a new card reader/writer (GH-CRM1A-BK), which is compatible with 51 different kinds of media, for ¥980, in early November.
It is a bus-powered device so that you don't need an AC adapter.
Compatible OS: Windows 8.1 / 8 / 7 / Vista / XP (32bit SP2 or later), Mac OS X 10.4 or later
USB: USB2.0 / USB1.1
Data transfer speed: Maximum 480Mbps (USB2.0), 12Mbps (USB1.1)
Length of cable: 9.5cm