Propeller: 48mm 3-blades propeller, Battery: 7.4V 400mah 30C lipo battery, Item name: Mantis85 85mm FPV Racing Drone, Size: 100mm*100mm*25mm, OSD: Betaflight OSD, Brand name: Happymode, Wheelbase: 85mm, Motor: Happymodel SE1102 KV9000, Buzzer Ready, Firmware of Flight controller: Betaflight 3.1.7, Weight: 49g(battery not include), VTX: 5.8g 25MW 48CH NTSC/PAL Video transmitter, Flight time: 4minutes, Camera: 600TVL HD CMOS 1/4inch, Flight controller: Supers_F4 Flight controller built-in OSD.
Just check coupons out (with price alert and 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 coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($110.02): BGDAVIS
2. ($110.59): 7bcdf9
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): BGMantis85, AFfbG10, 502C6B, BGBFCR25, BGMantis, BGCITYADS2019, BGMPB2020, BGAFF10OFF, bGhOnEy10, BGdragonBoat, BGVMantis, BGSS10%SW, BGMantisD, bgshOOp10, BGRC902, BgoFErTaSchInA10, BgcLuBofErtA10, BG11PP12, BG10RACING
(there’s a little possibility that old coupon will work)
Price history and price alert
Price history (for all/most countries) for Happymodel Mantis85 Drone BNF is here. The lowest price was: $69.99.
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)).