i priced up a front lip for a 32 gtr about 1 1/2 years ago from lander, nepean motor group, and hornsby nissan.
im a mechanic, so they all gave me trade price, lander and nepean were around the same price, hornsby were around $100 cheaper!
where i worked, we used lander and nepean a fare amount. went to pennant hills for 2 weeks, thought id call, and they gave me the cheaper price straight off the bat.
other than that, i havnt really tried anyone else.
please note-ALL 3 above mentioned did help me search for the part, just that hornsby had the best price.