In the US, you can go to just about any Radio Shack and tell the clerk what each end of the cable needs to be, and they will set you up with adaptors and cables to get it done. If describing what you have will be difficult-- and it often is-- you can take digital pix along to show them, or another cable end that has the ends you need,
or count the pins to connect with. Or take the devices you want to connect, if they are small enough for portability.

~Susan