I'm pretty shocked at those prices. I just quickly checked TradeMe, which is the New Zealand site for selling and buying stuff. Prices range from NZ$15 up to around NZ$150 (hand-raised young birds at the moment seem to range between about NZ$80 and NZ$150). I'd be expecting to pay around NZ$70 or NZ$80 for a hand-raised cockatiel if I was buying one.I've never had an interest in owning a Cockatiel, so I've never paid attention to their price, but I'm also surprised to see how expensive they are! The cheapest one I could find online was listed for $85, though all others were $100 or over. The most expensive I found was listed for nearly $300!! The most common prices I found were between $150-250.
NZ$15 equals about US$10.
NZ$80 to NZ$150 equals about US$50 to US$92