SA Footy

Anyone know any decent sites, possibly australian ones where i can get some decent music related shirts...

You don't say what music you like, but seeing as you're going to Soundwave, then http://planet13.com.au/ will probably be right up your alley.

An Aussie one http://bandtshirts.com.au/
A British one who I've bought from and recommend http://www.bluecatstore.com/
A DIY one http://www.pistolclothing.com.au/

The only place to go for Aussie stuff

http://www.lovepolice.com.au/?section=home