These drives are consistently at $73 on sale at NCIX.
NCIX.com - Buy Western Digital Caviar SE16 640GB SATA2 7200RPM 16MB Hard Drive OEM 3YR MFR Warranty - WD6400AAKS In Canada.
As for shipping, yeah, you do have to pay for it at NCIX, but you avoid PST (edit: if you live outside of BC).