I took a look at their products on Lazada and found that they sell cables, power banks, USB chargers, etc.
Vesternet started having their Vesternet Mondays promotion since 27th June 2016. During Vesternet Mondays, you will get up to 20% discount for Vera, Fibaro, Aeon, Qubino, Foscam, and Popp Products. Every monday there are different products on sale.
On 11th July 2016, I bought the Aeon Labs Aeotec Z-Wave Siren for £29.02 (S$51) down from £35.83 (S$65).
The listed price is £29.17 (S$52) but they do offer bulk discount if you buy either 4 or 8 units. In my case, I bought 5 of it and hence the price of £26.24 (S$47) each.
Li Xiang and I are typical working adults. We leave the house at 9am, and return only after 9pm. Sometimes we will forget to switch off the storage water heater and there goes a few dollars to the electricity bill.