Hi
You could try dick smith, they have 2 handheld uniden scanners the 72xlt and 92xlt models, they both receive the vhf aircraft band which is 118mhz to 137mhz.
And also try this site for freqs
http://www.nzscanners.org.nz/index.phpto join is free and they have a online database for freqs including aircraft of auckland.
But here are some freqs for auckland to note down
120.500 auckland area control
118.700 auckland tower
119.500 auckland control centre
120.800 auckland tower secondary
121.900 auckland ground
123.000 auckland international approach
123.900 auckland ocianic control
124.300 auckland north control
124.400 grt barrier island traffic
125.500 auckland contrl centre
125.700 rnzaf whenuapai
126.000 auckland control south
128.200 auckland delivery
129.500 auckland control
129.600 auckland control radar
131.000 auckland ramp (air nz)
131.900 auckland ramp (international)
132.900 auckland ramp (domestic)
134.000 oceanic control (secondary)
122.100 warbirds freq
129.900 nz airworks nz ltd (westpac trust resue helo)
130.300 air nz domestic
131.300 police (eagle helo)
131.600 nz post
131.900 international flights (many)
133.050 auckland coast guard patrol
133.650 massey uni school of aviation ardmore
133.700 auckland aero club
133.825 ardmoe flying school
134.050 qantas (international flights)
134.450 auckland gliding club
Well that should help, put those into your scanner radio and see what you get.
all the best from Jason in Wanganui.
(South Pacific HF Feed).