Try some job posting Web Sites: www.monster.com, www.seek.com.au, www.jobs.net. Advertise, stating your requirements.
Obviously, this depends on the nature of your business. If you want actually employ developers, try the above. However, if you simply want an E-Commerce Web Site developed, you have literally thousands of options.
There will be quite a few local Web Development firms in your nearest city. Try searching Google, also.