sorry i cann't help with advice about twins - i've never had any. but i just wanted to wish you luck. there are a couple of baby shops in canberra 'mum's and bubs' (which has recently changed it's name to something else, cann't remember what, and ownership) and 'babyco' are probably the biggest two - they should both have websites. be warned though, they do seem to be rather expensive. the internet might be a better option if you can arrange for the delivery to arrive after you have moved.

hope i have helped a little.