I have just checked coupons. The lowest price I could get is $28.49 (in Banggood). ULAC 110dB Loud Bike Lock 6 Months Battery life Steel Cable Anti-Theft Bike Lock for Road Bike.
Updated:
Banggood
Warehouse in China.
Link: ULAC 110dB Loud Bike Lock
Regular price: $29.99
$28.49 with coupon: BGCYCLE5
Additional Banggood coupons:
1. First page
2. Second page
Aliexpress
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Price history and price alert
There is only one database record (it was for $25.99), so you can’t see price history chart.
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)).