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. 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 price update (UTC time):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($69.51): BGWSCYT1
just apply this code in your cart 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)).