Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Material: Aluminum alloy Shell + Copper cable, Efficiency: ≥80%, Fan diameter: 12cm/4.7″, Color: Black, Output Voltage: 12V 16A, Suitable for: Desktop computer, Power supply standard: ATX 12V, Output Line Length: About 50cm/19.7.”, Cable Length: About140cm/55.1″, Product Size: 15x14x8.5cm/5.9″x5.5″x3.3″, Input Voltage: 115~230V (Manually switching voltage), Rated power: 600W, Peak Power: 800W, Interface: 24P+8P+(6+2P to 6+2P)+ (3*4Pin+6*SATA)
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 code price check (UTC time):
Banggood
Banggood warehouse is located in Europe 
. There is no active coupon in my database right now (for Banggood). I don’t really know if this price is reasonable, coz there’s no price history in my DB.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG407e90, BGCAPITALOS8
(probably won’t work, but you can try them out)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $29.99.
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)).