yea avi, i noticed that some really awesome artists will do sketches and then sell those for extra $$ on the side on ebay and stuff. it's pretty neat. you kind of have to dig a little though, but it's worth it.
xfer, i have a book like that about de chirico actually. like, little snippets about his most bizarre stuff and what not. it was awesome to read it.
art books are unfortunately expensive though.