Just check coupons out (with price alert and history). What is best price?
304 stainless steel, Top outer diameter: 38mm, silicone, Bottom diameter: 25mm, Material: PP, Top inner diameter: 34mm
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
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Price history and price alert
Price history (for all/most countries) for Refillable Coffee Capsule Cup Filter 3pcs is here.
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)).