Hello Redford and welcome to the Cow Audio Forum.
Sennheiser G3 and Audio Technica 1800 wireless mics are acceptable entry level gear.
Be advised that 2 mics is good, but three puts you in a situation where you need to begin thinking about a mixer because the camera only has two tracks. Combining three mics on to two tracks is always a compromise.
Regards,
Ty Ford

Want better production audio?:
Ty Ford's Audio Bootcamp Field Guide
Ty Ford Blog:
Ty Ford's Blog