If you buy only one book on any subject of jewellery, this one is the one to get. frugal or not it's worth every penny. The titile is Jewellery Concepts and Technology, by Oppi Untracht.
I second this. The book is amazing! Has everything you could
ever want to know about making jewelry. I am frugal myself, but
when I came across this book I had no trouble shelling out the
$100. Well worth it.