Been there a few times by myself and with my sister good place to go if your after the latest music sheets for your guitar/piano they have most of the latest stuff and some older stuff
The books are basically per album so you can get for eg Missy Higgins Sound Of White in one book and can be played on piano guitar
They usually have a PGV on the cover some where that means you can play piano guitar and it has the words
If you can't find what you want there go next door to mushgroves they are about the same price
The books are about $32 - 35 or some are best of which are all the good songs from all the albums there about $45