How do l get the sensor?

Based on your question, it seems you're interested in buying a sensor. From the PriceCheck search results, the Smart WiFi Motion Sensor Recharge looks like a great option. It's available for only R329 and allows you to detect motion in your home remotely using your smartphone. For soil moisture monitoring, the Gardena Soil Moisture Sensor Bluetooth could be a good choice. It's priced at R1364 and lets you keep track of your garden's moisture levels from your phone. Both of these sensors connect via Bluetooth, so you won't need to deal with any messy wiring. Please let me know if you need any other details on these products to help with your selection. I'm afraid the search results don't include some sensor types, but I'd be happy to try searching again with some different keywords.