After ensuring the right frame size, the next most important thing for comfort is the saddle. Unisex bikes can be a good choice for women but the saddle will usually not be.
The Canberra bike stores are fewer, bigger and more competitive. They will usually price match. Bike stores just want the sale. Kids grow fast, and once an enthusiastic cyclist, then always a cyclist. They know you will be back. Pricing for kids bikes starts from $200 and goes up to about $500.