Hi Lisa, just saw this post! I've emailed a response to you, but thought I'd put it here too in case you miss it.....
Here's a link to another Aussie shop on Etsy.
http://www.etsy.com/shop/vidastyle?ref=pr_shop_more
The owner's name is Melissa and she is in NSW in Newcastle. She will source the fabric for you if you can give her a link to a website page to show her the fabric you are after. Have you seen it on a website somewhere? Lots of the frabic sellers on Etsy have Amy Butler fabric, so Melissa will buy it from them at a good price and make up the cushion covers for you. Ask her for her best price. She is very reasonable I think, and her work is excellent. She's made several covers for me out of Heather Bailey fabric which she sourced from Etsy at my request.
As you're in Penrith, the delivery costs wouldn't be that much either which is good!
No doubt clp's and Rosie's sellers on Etsy are great too.
Linda.