Negotiation resources / exercises

Does anybody have any ideas for negotiation exercises for a business class of intermediate students.

I have been teaching these guys for a while and I have completely used up my bank of lessons.

Thanks in advance for any ideas given

Cheers

There may be something here:
TEFLtastic » Meetings and negotiations classroom handouts

Thanks fivejedjon

I've never used these and they look well set out

many thanks

Try here:
linguahouse.com/teachers
Use the advanced search to select Business English, Level>Intermediate and Topic>sales and negotiation