Im with limeslice. Because gumtree is free there are a lot of dodgy people.

I tend to only search locally as well and sell locally and meet up at a busy shopping centre or something.

Btw, off topic, the samsung kids tablet was on sale at bing lee a few weeks ago for $99 (s3). If you dont mind paying for a new one that is older version, id keep an eye out for sales (which usually ends up being cheaper than ebay!!)