Last year I made this bilingual (English and Italian) glossary for an English Interpreting exam. It contains marketing, finance, economics and business terms and expressions (one section of the glossary is dedicated to business-related idioms). You can find the references on the last page of the .pdf file (you need Adobe Reader to open it).
You can download it by clicking on the link below:
Ilaria Sclafani – Business English Glossary (.pdf, 1.6 MB)