Firmware: BLHeli_32, Support DShot300-1200/MulitShot/Oneshot/PWM, MCU: 32-bit STM32F051K6U6, Current Sensor: Support, Con. Current: 100A, Installation hole spacing: 30.5*30.5mm, Input Voltage: 3—8S, Peak Current: 110A, Maximum external size: 42*43.5*11.5mm.
Just check coupons out (with price alert and 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 price update (UTC time):
Banggood
Banggood warehouse is located in China. Too bad there’s no coupon right now in Banggood.
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): BG100A, AFfbG10, 502C6B, BGCITYADS2019, BGGEPPart, BGVDay10%off, BGRS100A, bGhOnEy10, BGdragonBoat, BGSS10%SW
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for Racerstar ReachUP 100A 3-8S RC ESC? There we go. The lowest price was: $54.99.
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)).