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there are lots of bike-specific tunnels designed for testing things like cyclists. just google low-speed wind tunnel and you'll get lots of results. Some in New England (MIT, some setup in CT), one in Colorado, and one in SoCal to name a few knowns.
Understanding the principals of how bikers get faster on their bikes is more efficient than wind tunnel time. You want to reduce your frontal area by getting a) narrower arms b) lower front end/shoulders/head c) legs closer to top tube d) an aero helmet.
Bike makes some difference, but being low and still able to pedal is the biggest thing. Talk with someone who knows about this stuff in person. There are plenty of wind tunnels that would be happy to take $1000 an hour to fit you and sell you wheels/helmets, but you can get 98% of the way there without the grams of drag feedback.
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