Go down and check coupons out. Remember to check price history if it is available. Best price?
Thickness: 3mm diameter: 40mm, Weight: about 31G, about 1 ounces
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 China.
Link: Banggood product page
1. ($2.00): BGherra
2. ($2.11): BGAFF10OFF
3. ($2.11): BGTT10
this code has to be applied 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): e2bcea, TTxBG10, 2019SPEDM, bgssaff9, AFfbG10, BG2Driver, 502C6B, BGBFAFF2019, BGCITYADS2019, BG2020NS, BGVDay10%off, bGhOnEy10
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Bitcoin Memorial Circular Collector Coin Silver is here.
Price records source(s): Gearbest, 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)).