Noise: 67.5-71dB, Suction: 600 – 1000Pa, Plug: EU Plug, Power: 30W, Working Time: 70 – 100 minutes, Water Tank Capacity: 80ml, Voltage: 100-240V, Dust Box Capacity: 350ml, Charging Time: 4 hours.
You can create price alert here, copy coupons and view price history. Best price?
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. Hmmm… There is no active coupon in Banggood at this moment.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): bGpAnDacHeCk, BGECD55, BGECD, BGED55, BGHOMEAPP, BGDECZ55, BGAFF7OFF, BGCZDE55, BGECDE5, BGECZ55, BGSPSEE7776, BGHCLE15, BGCZE55, bgshOOp10, BGHOMEAPP13, BGCZECVA5, BGHOMEA13, BGCZESCDE55, BGCZECVA55, BGCZBFED55, BGCZDEBG5, 7bcdf9, BG10OFFAFF, BGCZEDE5, BGwhielabel, BGCZEDE55, BG10OFFAFF1, BGCZDTRE, BANGGOODSD, ADMITAD2212, BGCityads10, Terence, Tabby20, 2203ActiesNL, 8Couponsde, MVC8SPRING
(I don’t think these’re gonna work, but you can try ’em out anyway)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – ECOVACS DEEBOT DE55 Robot Vacuum Cleaner [EU] ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for ECOVACS DEEBOT DE55 Robot Vacuum Cleaner. The lowest price was: $139.99.
Price records source(s): Gearbest, 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)).