You can get Retro TV for 17.69 USD with coupon (from Banggood). Basically copy coupon, view price history or create e-mail price alert. Best price?
Latest coupon code price check (UTC time):
Banggood (17.69 USD)
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now… Well, is it a good price anyway? It looks like it’s a good price (lower than average (19.77 USD)).
Link: Banggood product page
Price: 17.69 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG559876, BG589b2e, BG67fd7d, BG18fa9a, BGa01c5e
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for SF900 4700 Games SNES NES Retro TV Game Console on Aliexpress
Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for SF900 4700 Games SNES NES Retro TV Game Console.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).