You can get RadioMaster Micro 2.4GHz RM 4-in-1 RC Module for $74.74 with coupon (from Banggood). Go down and check coupons out. Remember to check price history if it is available. What is the best price?
RadioMaster Micro 2.4GHz RM 4-in-1 Multiprotocol Module – JR / Nano For Zorro Boxer TX16S MKII TX12 MKII Radio Transmitter – FCC Version
Latest coupon and price update (UTC):
Banggood ($74.74)
Banggood warehouse is located in China. I don’t think there is an active coupon right now – at least in my database. Price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $67.87)
Link: Banggood product page
Price: $74.74
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGAUGUST8, BGCAPITALOS8, BGCOUPERT8, BGCOUPERTBF8
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for RadioMaster Micro 2.4GHz RM 4-in-1 RC Module is here.
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)).