US$2.27 including delivery off aliexpress. Usually takes 1 -2 weeks.
https://www.aliexpress.com/item/3298...chweb201603_52
[EDIT] I just realised that this question gets asked all the time, but not everyone can be arsed setting up an account. I have an account so I just ordered a half a dozen. Hit me up if anyone wants one when they arrive.
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