Everyone's got a RadShack... I usually use a family run local electronics place - they know me, I know them, they've got solid stuff for reasonable prices (think I pay about $9CDN for 2ft stereo analog interconnects with spring strain relief). If you can find a little dive hole-in-the-wall where the guys look like real techs (buggy eyes, pale as heck) - try them!

Bren R.