I use to get the Antex which is good
But you may find to keep them at bay even if you just have a few you will have to reapply every 3months or so
It's about $5 at places like Big W Coles etc
A while ago I saw a Ant/Cockroach one I think that was the same brand but have not seen for a while
They do a variety of other products that are fairly cheap like 4l Distilled Water that's at Woolies
Good for things like Irons Steam Cleaners etc where the tap water can be too hard and it corrodes the unit or you have to much lime in your water not the cordial kind