Excel 2007 : SUMPRODUCT total

How can I modify this counting function to total the values in Column B if they meet the date/amount criteria? I thought adding ,B:B) would do it, but it errors.

=SUMPRODUCT(--(A:A>=DATE(2005,10,1)),--(A:A<=DATE(2006, 9,30)),--(B:B>=1),--(B:B<=19.99))

Thanks!
Bryce