Basically copy coupon, view price history or create e-mail price alert. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Frequency: , Handcrank recharge, , Compact and portable, Earphone jack, DC adapter jack, Proprietary tuning knob speed control, 5 inch Speaker with excellent sound quality, High Efficient Power generator for cranking charging, Built-in Emergency LED light, FM / MW / SW (1-2) 4 -band receiver system, AM: 525~1710kHz, FM: 87~108MHz
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($52.91): BGAudio9
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGMumlatzimP, BGAUDIO, BG9ba0e8, BG1b5830, BGSaleFeb8, BGAudio3, BGSCHOOL8OFF
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for TECSUN GR-88P Digital Radio Receiver.
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)).