Woolworths in E&C sell them.
Otherwise Lakeland Limited sell them and they have a website.
I have some (purchased from Woolies) and they do seem to dry quicker although not much difference with creases.
mothballs as they used to be don't exist anymore, because one of the chemicals used in them turned out to be detrimental to the health.
but we recently found some great wood blocks, and herb packets from Lakeland Plastics, which work really well.
i think the blocks are cedar wood, and the herb bags are lavendar and thyme, and something. We hung them in our wardrobe, and put them in our draws a few weeks ago, and have only seen one moth since (which is a lot better than being attacked by about 50 every time you opened the wardrobe!)