RFXCOM has great transceivers for 433 MHz. I’ve been using them for over 15 years.

I’m currently using a similar setup to monitor a 433MHz fuel tank sensor, rtl433 is a great project.

SONOFF make a Wifi RF Bridge which has a 433MHz transceiver and can be flashed with Tasmota, I’ve experimented with it for controlling RF controlled lights.

Broadlink also do RF transceivers, although only used their IR devices.