Brand：Lintratek, Size: 130x100x200m, Frequency: 900MHz, Working temperature: -10c~550, Power supply: DC5V1.5A, Gain: 60±2dB, Model Number: KW13A-GSM, Weight: <0.3KG, Output power: 13±2dbm, Coverage: About 50-200㎡ / without barrier. Basically copy coupon, view price history or create e-mail price alert. What is 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. ($69.51): BGWSCYT1
paste coupon code in your cart and click Apply 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): 2022ACTIESNL, Terence, 2203ActiesNL, BG1eb3ac, BG1efeb0, 8Couponsde, tRaDetRaCKeR, 8wEbgaInS5, hoNEYbGdeAlS, BGJUNEGSG9
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Here is price history (for all/most countries) for Lintratek KW13A-GSM Wireless Network Signal Booster LTE 2G 3G 4G. The lowest price was: $29.99.
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)).