Some of the large chain stores here in Vic don't even do gift registries which I think is just silly.
If you cannot find anything a few other options would be A) pop everything you want on layby and give people the layby number so they can contribute towards it, depending on the store people may even be able to take the item with them. B) Create a list of the things you want and give that to whoever is helping organise your shower that way people can enquiry with that person and "buy" off your list.

hope this helps

Nae x