Check your library. If they don't have a good bargello book, ask about inter-library loan. Most libraries are connected to others and can find many more books for you than they have in their own shelves.
I just got a twisted bargello book from our library and took it right back! It was totally out of my league. I need to stick with the standard ones for awhile.
Look at QuiltersTV and see if the Billie Lauder bargello video is still up. I used it to make my first bargello and was very pleased with how it went together.