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Bestek via Amazon has Universal Travel Adapter & 220V to 110V Converter w/ USB Charging (White/Black) [amazon.com] on sale for $ 19.99 with 48% OFF coupon code 9HA4QLUS Shipping is free.
BESTEK Universal Travel Adapter & 220V to 110V Converter w/ USB Charging (White/Black) for $19.99 + FS