Warm up for the violinist, written by Carol Ann Wheeler is a book that is down loadable with audio  from Melbay for $10.00 I have seen it cheaper at different sights but I'm not sure you get the  audio with it. While the exercises are fairly simple to memorize executing them at the different speeds and being in tune with  the audio is quite challenging. Weather your a violinist or a fiddler I'm finding these exercise both challenging and enjoyable. From beginner to an advanced player I believe you find these warm up exercises to be beneficial to your playing.

If your looking for some new material might give this a look.

Mark