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They might be hard to find in Asia, Africa, or India; especially if you must use markets that are within walking distance of your home. What do you mean by really cheap? Can you buy on the net (paypal) from North America. Hong Kong, or Europe?
I'm in the USA, and I have a PayPal account, so I would look at AllElectronics and also search on eBay. I often find that cables aren't very expensive.