Battery High Energy Lithium Battery, Color Black, Stroke 12mm, Chaging Time 90 Min, Weight 1.04kg/2.40kg(Includes Charger And Packaging), Rated Input 100-240V~50/60Hz / 25W, Battery Capacity 2000mAh, Model Booster Pro 2, Working Time 3.5-4 Hrs, Sound Pressure Level 70 dB(A), Power 135W Max., Rated Output 25V/1A, Sound Power 78 dB(A), Rated Voltage 24V DC, Unloaded Speed 1800-3400/Min Max., Size 200*60*285mm, Material ABS.
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. You can get coupon down below.
Link: Banggood product page
1. ($176.63): BGCAPITALOS8
paste coupon code in your cart and click Apply after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGHB218, BG22f7a1, tRaDetRaCKeR, BGHECARE1, BG4ee866, BGHOM095, Cuponation9, BG75597c, BGd831c9, BG589b2e, JanBGCoupon8, BGSaleFeb8, BGSaleAD, BGMARCHSALE, BGAUGUST8
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Booster Pro 2 Deep Tissue Muscle Massager. The lowest price was: $99.99.
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)).