Hi, no personal experience here but did a bit of a search and worthwhile you check these links out as 2 are actual retailers and ithers links to previous discussions on the same matter so they also may help ?
Also I would think that the plastic surgeon would be able to point you in the right direction here as would the breast care nurse as they must have been aske thousands od times that exact same question... Might be worrh while asking them as well.
Jel
http://www.thebreastformstore.com.au/breastform-nipples.aspx
http://www.amoena.com.au/Products/Accessories/Adhesive-Nipple/Adhesive-Nipple-Almond#
There are also some old threads discussing this so I will paste a link to them here in case they are of use.
http://www.bcaus.org.au/phpBB3/viewtopic.php?f=33&;t=11998
http://www.bcaus.org.au/phpBB3/viewtopic.php?f=33&;t=13083
http://www.bcaus.org.au/phpBB3/viewtopic.php?f=8&;t=7772