Gouache links and sources

I've been doing a bit of digging around gouache techniques, resources and artists.
I was hoping for an amazon one-click solution but was sadly disappointed. There seem to be very few technique books around.

The one that is consistently recommended is that by Pamela Kay, Gouache: a personal view, Atelier 1995. Yet it looks as if it's difficult to get hold of (an Amazon price tag of £95 isn't very encouraging). Katherine at Making a Mark has written up an excellent post as part of her floral project on Kay's floral artwork, which is very much based on gouache.

I have also found a couple of interesting blogs by artists who work with gouache:

• Erik Tiemens' Virtual Gouache Land

• Jared Shear's Terra Peer
  

• I found both through Charley Parker's Lines and Colors , who has a whole number of review of art blogs on his site