I've found a USB cable on Deal Extreme which perfectly fits my needs.
It's thin and flexible (the same as the one E-Cig uses on their USB batteries) and ideal for those of you who are making DIY USB batteries. The only drawback is that it's only 3'3" (1 meter). But otherwise I think it's perfect. And it's only $1.68 incl. worldwide shipping.
DealExtreme: $1.68 USB Charging Cable for NDSi/DSi
It's thin and flexible (the same as the one E-Cig uses on their USB batteries) and ideal for those of you who are making DIY USB batteries. The only drawback is that it's only 3'3" (1 meter). But otherwise I think it's perfect. And it's only $1.68 incl. worldwide shipping.
DealExtreme: $1.68 USB Charging Cable for NDSi/DSi