$14.99 – Model: QS5010, Control distance: about 10m, Brand name: QS, Tail rotor diameter: 20mm, Helicopter battery: 3.7V 75mAh lipo battery (built-in), Flying time: about 6mins, Charging time: about 30mins, Product size: 8.2 * 2 * 5.5cm, Color: Black/yellow/red/blue optional, Main rotor diameter: 83mm, Controller battery: 4 * AA battery (not included), Item weight: 13g, Channel: 2CH, Functions: up/down / turn left/right, Material: ABS & electric components, Remote control: mode 2.
ATM you can buy QS5010 3.5CH Infrared RC Helicopter RTF for $14.99 (in Banggood). Go down and check coupons out. Remember to check price history if it is available. What is best price?
Latest coupon code price check (UTC time):
Banggood ($14.99)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Is it cheap? Well, this price is higher than average price ($12.71)
Link: Banggood product page
Price: $14.99
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGQS5010, BGQS50101, BGToys8, BGMatt2022, BG20c79f, BG589b2e
(these codes were not working in latest coupon update, but you can check them out anyway)
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.
Price history and price alert
Here is price history (for all/most countries) for QS5010 3.5CH Infrared RC Helicopter RTF. The lowest price was: $10.99.
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)).