Freshwater Farm and Anihana have shampoo bars but I haven’t tried them. First is sold at CW and pretty sure I’ve seen the second at Woolies.

Be careful they’re not soap based though. I tried the FF body and hair bar and it was literally soap

Ps. I don’t know your gender or preferences so the Anihana might skew strong fruity girly scents, while FF has a hemp option that might smell more neutral