Standard: EU standard, US UK AU Socket Adapter.
Aliexpress
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Price history and price alert
Check out price history chart (for all/most countries) for 2x WD-9 EU Plug to US UK AU Adapter. The lowest price was: $3.29.
Price records source(s): Gearbest
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You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).