Boblbe.e "MD Pocket"
Given as "omake" (freebie) when you order your gigabeat G20 online on Toshiba Japan website, the Boblbe.e "MD Pocket" can also be bought separately.
Price : ¥ 2,000
Maker website :

Logitec "USB Power Cable"
This cable from Logitec Japan can be used to recharge your gigabeat G20 using a USB port of your computer. Very convenient to power the Gigabeat, for exemple, at your office, without having to bring the original AC Adapter.
Price : ¥ 1,700
Maker website :