Plus Size Maternity

As if maternity wear was not expensive enough plus size often blows out the budget. Here are some great stores that sell plus size or up to an AU 18/20. If you are unsure of international sizing just Google clothing size conversions for a chart to guide you.
As a guide an Australian size is usually a size bigger than US sizes. Each brand will often vary slightly but most sites have a size chart for you to double check.
First off measure your bust and waist in inches and cm so you can compare!
http://www.destinationmaternity.com/plushome.asp

A great US site that delivers here and has prices starting around $10 They have a detailed size chart to help you out:
http://www.destinationmaternity.com/HomeSizeChart.asp

Though most stores offer a return policy it can work out expensive if you have to pay to send it back.

http://www.zodee.com.au/Womens/Maternity/
An Australian store with heaps of items including swimwear and bras with a few ranges in the plus sizes.

http://www.plusmaternity.com.au/Plus_Maternity/PLUS_MATERNITY_HOME.html
Sizes 18-28 and all in Australia!

http://www.gap.com/browse/category.do?cid=35426
GAP and their partners also go up to plus sizes in maternity and regular clothes. \

http://angelmaternity.com.au/angelStore/size-xxl/index.php/cPath/141/sizeId/141
Angel is an Australian brand with nice plus size clothing although getting up in price with most around the $50 and up mark.

https://www.facebook.com/CheapPlusSizeMaternityClothesOnline#!/CheapPlusSizeMaternityClothesOnline?sk=wall&filter=2
A Facebook page for finding stores that sell plus size clothes.

http://www.maternityrevolution.com.au/Products.aspx?Category=15

http://www.blestbras.com.au/browse/30/Maternity-bras.aspx
Larger size bras but I recommend reading the bra post below as the UK stores are cheaper and go quite large too.

http://www.plussize4you.com/plussize_maternity.html
US site with some brand names.

http://www.aurawoman.com.au/plus_size.asp
Small range in Australia.

http://www.figleaves.com/uk/
Clothing, bras and more. US and UK site. Click change currency up the top to select AUD and make it easier to shop.
http://www.figleaves.com/uk/department.asp?dept=Womens_Fuller_Figure&answerhandle=11693&searchhandle=A%253dwomenswear%2Bnot%2Bin%2Bolet%257eB%253dwomenswear%2Bnot%2Bin%2Bolet%257eD%253d12%257eI%253dCurrentPrice%257eK%253d4%257eL%253d1%257eM%253d354%257e&answerhandleback=11693

Asos has always been a favourite of mine and they have great plus size and I love free delivery:
http://www.asos.com/Women/Sale/Maternity/Cat/pgecategory.aspx?cid=6413

On sale for $15 with free delivery!!!