Material ABS+Electronic Component+Silicone, Massage Time 15 Miin, Massage Heads 12, Type Massager; Massager+Remote control, Temperature 40-45℃, Gears 20 Gears Adjustable, Color Red/White, Modes 12, Power Supply Built-in 450mah lithium battery.
Basically copy coupon, view price history or create e-mail price alert. Let’s see what best price is ATM.
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. There is one great coupon!
Link: Banggood product page
1. ($25.49): BG75597c
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): BG6eb429, BG06def7, BG5809db, Cuponation9, BG8d1c31
(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 12D TENS Low Frequency Pulse Shoulder Neck Massager. The lowest price was: $16.78.
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)).