Brand Zeblaze, Operating Mode Full-Touch, Bluetooth Version BT 5.0, Compatible OS Android 4.4 or above; iOS 8.0 or above, Model Stratos 2, APP Name InfoWear.
You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
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 price update (UTC time):
Banggood
Banggood warehouse is located in Europe 
. I don’t really know if this price is reasonable, coz there’s no price history in my DB.
Link: Banggood product page
1. ($63.74): BGc70579
2. ($63.74): BGbf11dd
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGe96c20, BG208016, BG83a3ec, BG807334, BGdf78aa, BGAEFDS, BG9a5081, BG51a3fb, BG38ecde, BG0ade55, BG854be8, BG4bf0b4, BGc6c449, BGHOBBY03, BGTRS2, BGRSUNZEB2
(these coupons are old, so probably won’t work)
Price history and price alert
There is only one database record (it was for $58.99), so you can’t see price history chart.
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)).