hi hen c and others,
jetstar do take in low hours pilots as f/os, most of their new f/os are qantas cadets though at the moment they do have retired rsaf pilots joining them. they do consider taking low hours people e.g. one of their local female pilot hours was low when she joined.
as for tiger if one is really interested and meet min. requirements i suggest you pay their office a visit with your c.v. and follow up call once every two weeks.