There are lots of options for packets of biscuits, or cake mixes etc in the health food aisle at Coles/Woolworhs.
There are some nice 'freedom foods' coconut biscuits and other brands. They'll say 'gluten and egg free' on the packet so just check labels.
If you really wanted to bake something, there are lots of good recipes online or in the Australia Women's weekly allergy cookbook. They have a great chocolate cake recipe that I use.
You do need to be aware that baking tins, mixers etc can be contaminated with gluten from wheat flour. You will have to wash everything very thoroughly, because people with coeliacs can react severly to a crumb or gluten residue. Depending on the severity of the egg allergy that can also be a danger.
It is often easier to just buy something in a packet.
Rice crackers and dips are also a good option.
If you get stuck, pm me and I'd be happy to share some recipes (I have a gluten free cake business, not that I'm advertising! Just happy to give some tried and tested recipes if you're desperate).
The allergy forum on here has some good suggestions also.
Edited by notjustyet, 02 February 2013 - 09:53 AM.