$16.99 – 300Mbps 1200Mbps Wireless WiFi Repeater Wifi Signal Booster 2.4G/5G Dual-Band WiFi Extender 802.11ac Gigabit WiFi Amplifier WPS Router – Black 1200M.
I have just checked coupons. The lowest price I could get is $16.99 for 1200Mbps Wireless WiFi Repeater Signal Booster (in Banggood). Check coupons or create price alert down below. Let’s see what best price is ATM.
Latest coupon and price update (UTC):
Banggood ($16.99)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. You probably want to know if this is a good price. From what I can see this price is higher than average price ($15.99).
Link: Banggood product page
Price: $16.99
Additional Banggood coupons: first page and second page
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.
Price history and price alert
Price history (for all/most countries) for 1200Mbps Wireless WiFi Repeater Signal Booster is here. The lowest price was: $12.99.
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)).