Hi,
They should sell them in health stores. There is also a product called Paragone which contains those three ingredients and which might be sold in health stores.

Another product that cleanses parasites is Colloidal Silver and also Grapeseed extract. I think you should maybe do some more research on products that kill parasites and have a look at the parasite forum before you try anything.

Another option might be to get one of those pre-pay credit cards which can be used online (don't know if they are available in Austrailia.)

Good luck with whatever you try.