Battery Capacity 2400mAh, Stroke 12mm, Color Black, Weight 1.2kg, Rated Voltage 21.6V 6INR19/66, Power 126W Max., Rated Output 24V/1A, Rated Input 100-240V~50/60Hz / 24W, Noise 55 dB, Battery High Energy Lithium Battery, Size 285*217*64mm, Frequency First Gear: 1300; Second Gear: 1800; Second Gear: 2500; Fourth Gear: 3300, Model Booster Pro 3, Material ABS, Brand Booster.
Just check coupons out (with price alert and history). 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.
Link: Banggood product page
1. ($180.31): BGCAPITALOS8
2. ($180.31): BGCOUPERT8
coupon code has to be applied in shop’s 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): BGHB218, BG1224b0, 2203ActiesNL, BGHECARE1, BG4ee866, BGbd354d, BGHOM091, Cuponation9, BG75597c, BGddb59e, BG3e7f26, BG589b2e, JanBGCoupon8, BGSaleFeb8, BGSaleAD, BGMARCHSALE, BGAUGUST8
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for BOOSTER Pro 3 Deep Tissue 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)).