[livinginkorea]

Try Market Leader. They have various levels and it's a business book with some grammar points. I think that it has three different levels and it's a great book for business beginners.

Another one is business basics which has tapes with it and audio scripts at the back of the book but that's an upper intermediate level. Also this is English-English, which doesn't bother me but could some teachers.

Interchange, as Mark said, is also a great book and also has a CD as well. I mentioned the CDs and tapes 'cas I guess you want to listen to them first for the prounication to teach your students.

Best of luck,

-livinginkorea