You can get GANWEI Woodworking Circle Cutting Jig for $31.99 using coupon code (in Banggood). Basically copy coupon, view price history or create e-mail price alert. Do you want to know what the best price is?
Adjustable scale range 37-172mm (fast adjustment), Compatible router diameter 65mm, Size 242x90x135mm, Material aluminum alloy + plastic transparent cover, Minimum milling radiu 30mm, Maximum milling radiu 300mm
Latest price update (UTC time):
Banggood ($31.99)
Banggood warehouse is located in China. There is no active coupon in my database right now (for Banggood). What about the price? From what I can see this price is higher than average price ($30.66).
Link: Banggood product page
Price: $31.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGWT15, BGe84201, BGWDT15, BG20236Tool, BG76cfa1
(these coupons are old, so probably won’t work)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for GANWEI Woodworking Circle Cutting Jig.
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)).