You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
128x 80, 110mAh, waterproof up to 50 meters, Bluetooth 4.2, 0.78-inch OLED
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. As you can see I didn’t find any active coupon for this product right now… I don’t know if this is a good price – number of records in my database is too low!
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!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): miband3EUR, mibannd3c, Miband3BRPT, mibannnd3c, mibannd3d, XIAOMI3, mibandd3c, miband3ptbr, miband3e, mibandhk, MIB3BRPT, M3BRPT, miband93, mibandma, miband20, miband204, 20miband, MibandPT, mibanndd, hkband3, MI3ITA, mibande, mibannnnd, miband3PT, 26band, 3Mumlatzim, 39miband, Mi3Oferta, fdband, 18band, BFMi3PT, Blackbr, BFMI3TOP, QueroMiB3, suecoupon, mi3br12, 12mband3, 19band, bgmi3, itband, MBJan10, Mi3fretebr, dlz3, bgband, BG22band, xiaomi33, bgband1, unboxinghk, 2ANO01B, bgband4, 10ANOBG, band5233, bandsexta, band1422, band18br, e2bcea, CE002, 502C6B, 12sjuros, band88R, zegar12, plmiband, BGabr90, BGabrm3, miband3BG, ptband3, TTxBG10, plmi999, armiband3, band10, BGbpm3, BGBAND23, BGMM3, 2f6553, bgmm3, AFfbG10, bgx3m, 59f3aa, 0e7f33, FBCOUPON1, BGM3AP, BGM3MAY, c7345d, BGBAND3N, BGM3CZ, BGCZMB3, BGESPM3Z, BGEUMB3, BGM3ES15, BGCuponation10, BGWRIBAND10
(there’s a little possibility that old coupon will work)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $11.45.
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)).