If you played the Table Top and loved it then it really is a must have purchase. It's still early days and there are a few odd things here and there but they are issuing patches on a regular basis.
We are always looking for new players the Blood Bowl Forum just got granted Division status so there has never been a better time to buy it.
Retail boxes hit aussie stores later this month if you don't want to grab the Digital Download version. Games Warehouse have got a preorder page.
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As they are sponsors of TOG you might want to click through from the TOG site and buy it there.