I bought the Aeon Labs Aeotec Z-Wave MultiSensor 6 from Automate Asia for S$110, alongside the Smart Switch 6. It runs on Micro-USB power or two CR123A batteries (not included), which last about two years, packing six sensors into one.
Android Pay is now available in Singapore, the first country outside the US and UK, and the first in Asia, to get it. It works with VISA and MasterCard cards from DBS, OCBC, POSB, Standard Chartered, and UOB.
I bought the Aeon Labs Aeotec Z-Wave Smart Switch 6 from Automate Asia for S$110, so new it wasn't yet on their site. After the Fibaro Starter Kit hooked me on energy monitoring, I added these for my always-on appliances.