John,
I highly recommend this book by Sollman and Harris

Mastering Instrument Flying
Item Number: M279A
Price: $34.95

Bob Gardner's "The Complete Advanced Pilot" is also another great
'complete' instrument training book.

Eckalbar's "IFR: A Structured Approach" is an excellent book but
IMHO, S&H's book is a better book to start.

Rod Machado's Instrument Pilot's survival manual is also a good book
but not as structured and complete as S&H and Gardner's books.

I use this website:

www.campusi.com to search for best prices on books both new and used.

Hai Longworth