Tinysa 100kHz-350MHz Tiny Spectrum Analyzer [EU] (Banggood, Aliexpress: Display resolution 320 * 240 pixels, 16 bits per RGB pixel, TinySA’s input/output specifications are divided into 4 modes, Optional TTL USART port on the internal PCB (SW not yet implemented), Slow switch control, 2.8 inches diagonal screen, Resistive touch control, USB serial port control, Linear power supply to avoid switching noise (the best price with coupon)).
You can create price alert here, copy coupons and view price history. Do you want to know what the best price is?
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):
Banggood
Banggood warehouse is located in Europe 
. I don’t really know if this price is reasonable, coz there’s no price history in my DB. Well, there is one coupon available right now.
Link: Banggood product page
1. ($65.14): 13f142
apply it in your cart 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): BG09975, 7d18f7, BGherra, BG11SHOP, BGG09975JP, BGJPiio024, BGG09975CZ, BGG09975, BG1G09975
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
We don’t have enough records in database to show price history for this item. BTW: We have only recorded this price: $49.99.
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)).