Start by considering the product or service your business offers. Can you trade it with another company? For example, say you own a small widget company in the Kalahari Desert. It just so happens that the ice cream store next door needs a steady supply of widgets to keep their freezers running smoothly. Can you supply them with widgets in exchange for a gallon of mint chip every Tuesday for your hot, sugar-addicted employees? You get the idea.

What about free tickets to events? Many local theaters and comedy clubs are desperate for warm bodies to fill the seats. See if you can get discounted group rates. Do you have any friends who can scam you cheap or free tickets to concerts or sporting events? Such perks are always appreciated. Do you do a lot of business with a local social/retail/country club? They may provide you with discounted membership opportunities.

Can you afford to swing lunch for everyone on Fridays? This has the double benefit of not only keeping people happy, but keeping them on site, too. (Especially since many people extend their Friday lunch hour to an hour and a half or more.) A periodic bagel run is always appreciated - especially on Monday mornings. This is an inexpensive way to boost morale and keep people productive. 

Work in a big city? Public transportation passes will be greatly appreciated by your staff. Got a lot of frequent flier miles racked up? Consider giving free plane tickets to employees as bonuses.