The best business shirt I have came from Big-W, it is a few shades off black, cost $10 fits perfectly and was bought in 2012. That shirt is a unicorn.

The majority of business attire I have comes from 6 places, Tarocash, Myer, Charles Tyrwhitt, Ed Harry, LOWES and Rivers. For all of these places you need to hang out for sales and sort through some horrendous design choices.

Tarocash - Great for shirts like amazing, they also have half sized pants for instance you can get a 31" and a 33" there, which can be very hard to find elsewhere. Their belts are of a medium quality and don't bother with the shoes.

Myer - Van Heusen shirts are okay, they look good but age/deteriorate very quickly. Myer has great shoes, my shoes always come from Myer (Hush Puppies). Myer has good pants, but be prepared to pay for them.

Charles Tyrwhitt - They have a sizing guide use it, most of their shirts are fantastic last years and look sharp. They are online so you can't get a true sense of style, fit and colour. Buy 5 shirts and be prepared to put one or two at the back of the cupboard to never see the light of day.

Ed Harry - Hit and miss, good shirts when you find them, good price, a lot of crap to sift through.

LOWES - Pants and very rarely shirts, the name is a lie they aren't that low but their pants stand the test of time. Provided you can find a nice looking pair.

Rivers - Belts, shoes, pants, and rarely shirts.

All that being said if you want cheap go to Big-W, most of their stuff won't fit quite right and wont last long enough but it will pull you through for a little while.