In an earlier post, we discussed how you should choose a potential marketing partner. With the economic climate being what it is currently, you should revisit this process.
Just because the incumbent is the incumbent doesn't mean you should keep them--or shed them. Ask for regular reviews and to revisit your contract or pricing structure. If they can afford it and you need to make cuts, come to an understanding so you both can survive. You can make it up to each otehr later.
You should also broaden the scope of your view of suppliers. Many times you might be able to get away with one supplier rather than two or three. Can your branding agency handle your trade show program? Can your trade show house support your branding and marcom mix? Do you hyave an outside consultant who can broker all of the above?
Be creative in your approach and consider the many alternatives. There is more than one way to skin a cat.