Case material PC, Battery weight 500g, Life time 5h, Battery capacity 6400mAh, Suitcase size 555x 384x 220.5mm, Battery power 92Wh, Lining material Fabric, Standby time 24-48h, Weight 6kg, Size 20inch, Case capacity 31L, Package size 470x 301x 680mm.
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Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($572.40): BGTRIP01
2. ($606.07): BGAFF10OFF
3. ($606.07): bGhOnEy10
4. ($606.07): BGdragonBoat
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): AFfbG10, BGDAIC1, BGbag1023, BGCyber10, Wholesale20, BGTS785, BGTS204, BGMPB2020
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Xiaomi COWAROBOT 20inch AI Driverless Luggage 31L. The lowest price was: $418.36.
Price records source(s): Banggood
Click on image to enlarge. 
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)).