| Tantrum992 - I got 40 pairs off e-bay for less than a fiver. There seems to be plenty of them up for sale. You can choose from 40 pairs all the same or 10 pairs of 4 different kinds - gives you the chance of trying different types out until you find a particular type you like. My only trouble is I end up leaving the spent ones round the house much to the annoyance of my other half. | 
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