Max Charge Capacity: 300W, Input Voltage: DC 10-30V, Pb(1-10S), Supported Batt. Type: LiFe/Lilon/LiPo/LiHv (2-8S), Charge Current: 0.1-15A, Discharge Current: 0.1-15A(Recycling mode), Output Voltage: 0-30V, NiMH/Cd(1-20S), 0.1-3A(Internal consumption mode), Max Discharge Capacity: 20W.
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 and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($35.99): BGAFF10OFF
2. ($35.99): bGhOnEy10
3. ($35.99): BgoFErTaSchInA10
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): ToolkitRC12, 502C6B, aff7off, TmotorDc, Charger12, BGToolkit15, PU15, BG28SLIPO, BGM8DC, BGToolkitRC, AFfbG10, SKUB05581, BGM820, BGM82, BGBFAFF2019, BGCITYADS2019, BGM8PRO, BG20OFFCD18, BGM83, BGBCPRO1, BGM8DC15, BGBC1, BGdragonBoat, BGToolkitRCM87, BGRCBC7, bgshOOp10, BgcLuBofErtA10
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – ToolkitRC M8 DC 300W 15A Battery Balance Charger [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for ToolkitRC M8 DC 300W 15A Battery Balance Charger is here. The lowest price was: $30.99.
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)).