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I bought two TSL257 optical pulse sensing sensors from the shop but I don't think I am going to use them. They come with the shrink wrap that is included but not the stereo plugs, because I used those! Had I not done that I would have probably asked if I could return the sets back to the shop itself. The sensors themselves are brand new, not opened. 

Looking for £3 for each sensor of £5 for both.