For Melburnians. You can ring ahead, and check if you can try out the product in store (if need be). eg I have a camera that is only tested to 2GB so I checked and they said at the time, that I could try out the 4GB. I went in, checked, and it worked. :) <br/>
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I don't know many places that let you check out memory cards, even if you ring ahead.
Price-wise there are cheaper places (Shopbot). However being able to go into the shop front and check with your own camera can be priceless.