About $9 each in single quantities
http://www.national.com/mpf/DS/DS90C387.html
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=DS90C383MTD-ND
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=DS90C387VJD-ND