You can always pull the fuel rail, tilt it back, put a paper towel underneath, and have someone crank the car. I'm willing to bet all but the one you think is bad spits out fuel. So all you need is an injector! Yep, they are expensive. You might be able to find one here on the forum used. Think of it this way, if you had taken it into the stealership, they would have charged you $80 to figure out it was an injector, $130 for the injector, and another $80 to install it.
Speaking of which, removing the old injector can be a major pain in the ass. I had to get a "screwdriver" that twists when you hit the top with a hammer. Start soaking those screws with PB Blaster now! I replaced the screws I pulled with bolts I got from Home Depot in case I ever have to take it out again...