Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Transmission Distance 10m, Battery Capacity 4000mAh, 7h(50% volume), bluetooth Chip CW6611E, Charging Time (h) 4-5gh, Connectivity bluetooth/ AUX-IN/ U disk, Output Power 10W*2, 3.7V, bluetooth Version V4.1, Charging Input 500MA-1A, Microphone Yes, Working Time (h) 4.5h(100% volume), Input Voltage DC5.0V
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($58.90): BG1b5830
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BG15WA2, BGss506, AFfbG10, BGBWWA2, BGWA2001, BGwa2p5, BG15WA2Q, BG3xwa2, 502C6B, BGWA2BT, BGNAWA2, BGWA2BF, BGWA288, BGBWWA222, BG20CES, BGVDay10%off, BGGR409, EARSP11, BGWA2UKK, BGCCWA2, BGAFF10OFF, bGhOnEy10, BGBW152, BGRWA2, 7d18f7, BGSS10%SW, BGWA2777, bgshOOp10, BG11SHOP, 10%ForNewBW, BG4BW25, BGLOAC1, BGWA2ESA, BGissam02, 10%ForBGBW, BGLOAWA2, BG24a812, BGed79d8, 13f142, BG7WA2, BG43450c, BGc3a8a5, BGBuscape01, BGWA2BW, BGBRPL2, BGHOTSHOP15, BG8e496f, BG53e9c8, BGAlerabatKL, BG023bfd, BG41ac1c, BG2f9724, BGAUDIO, BGf5a425, BGWA2Z, BG9ba0e8, BG9aa50e, BGSaleFeb8, BGAudio3, BG35ba1f, BGa59b69, BGe775c4, BGa36fc7, BG763516, BGAudio9
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 2 another warehouse/versions!
1. Europe – BlitzWolf BW-WA2 20W Bluetooth Speaker [EU] ($-3)
2. China – BlitzWolf BW-WA2 Lite 12W Bluetooth Speaker ($-3)
Price history and price alert
Price history (for all/most countries) for BlitzWolf BW-WA2 20W Bluetooth Speaker is here.
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)).