CamelCamelCamel
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Cheapest I could find was eBay for around $60 from International sellers or $89 from an Australian seller and >$100 from Harvey Norman, Officeworks. I don't use my tablet as a netbook so not sure if its worth getting, might opt for one of those roll-up bluetooth keyboards for traveling and occasional use..
Not many folks have this unusual size Tab (most people either have the 7" or 10") but maybe its useful for someone :)