[fauxfauxpas]

No experience with these, but a search through freshmeat shows packages with inventory modules that might work: NOLA http://freshmeat.net/projects/nola Zephyr Basecamp http://freshmeat.net/projects/zbcenterprise NolaPro (don't know if related to NOLA) http://freshmeat.net/projects/nolapro WebERP http://freshmeat.net/projects/weberp OpenBravo http://openbravo.com/