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).