Model RG353VS.
You can create price alert here, copy coupons and view price history. Best price?
Aliexpress
I could not find it 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 China. You can get coupon down below.
Link: Banggood product page
1. ($79.99): BG3376fa
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG717000, BG589b2e, BGMARCHSALE, BGCAPITALOS8
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for ANBERNIC RG353VS 128GB Game Console is here. The lowest price was: $79.99.
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)).