Hi @Gw34 and welcome.
GROW Australia seems to have 8 groups within 40km of the Perth CBD but they're not specifically for people with bipolar.
I'm pretty sure the Mental Health Foundation Australia has virtual support groups for people with bipolar, probably based in Melbourne so running on AEST.
I'm not sure what's available for carers, maybe Carers Gateway could help advise.
There's a lot of folks here on the forums with various flavours of bipolar and schizoaffective disorders - it's great to have you here! Would you like to discuss matters bipolar, or get on board socially? We do it all!