Output: AC 100-240V 50/60Hz 10A Max;, Material: PC V0;, Input: AC 100-240V 50/60Hz 10A Max;, Wi-Fi: IEEE 802.11 b/g/n 2.4GHZ;, Dimension: 42.6X42.6X20mm;.
Check coupons or create price alert down below. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
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 China. There is one great coupon!
Link: Banggood product page
1. ($76.00): BG589b2e
put item in your cart and apply coupon code there 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): BGSTHO15, BGHONEY2110, BGSHOM15, BGSHE15, 13f142, BGSmart6, 8BGwbg2204, 2203ActiesNL, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, Cuponation9, COUPONSDE1wk, BG8ReviTrage, BGcoupon8off, BGGutscheine, BG00c906, BG8OFFCOUPON, TTBLACK5
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for 10 pcs. SONOFF MiniR2 Two Way Smart Switch 10A? There we go. The lowest price was: $50.99.
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)).