Blank Kanvas Co. are now offering free shipping on all orders over $20.00 within Australia. Check out http://www.blankkanvas.co/ for high quality, ethically made and environmentally sustainable fashion apparel without the hefty price tags! More brands to be stocked soon!
Since you're here and your (mobile) web store doesn't say much, perhaps you'll want to explain what makes your wares ethical, sustainable and why anyone on OzBargain would want to pay $20 for a t-shirt?
You might also think it ethical to add your ABN to your missing "About Us" page?