Any Radio Shack, Best Buy, Walmart or Target carries standard analog audio cables, usually sold in connected pairs (for the left and right stereo channels) with red and white connectors.
Hell, most a/v components come with a cheap pair of such cables in 3 foot lengths. Since I always replaced those with better cables in the old days and do digital audio now, I probably have a dozen or pairs in boxes in the attic.
The fact that these are so easy to come by, and that you specified white, suggests to me that you may have something else in mind, in which case it would be better if you explain what you're trying to accomplish with the cable, and what you're trying to connect. What you're asking for may not be the best solution for whatever its is you're trying to do.