I rode Aluminum Overcast on Tuesday, 23 July. Let me just say, it was WORTH every cent!! I was at the Norden bombsight in the nose when we passed over KOSH. Awesome.
Save up, scrape up, hell, check under the couch cushions, but find the $$$ to do it. Like the volunteers told us, the money raised from ticket sales is what keeps her flying, and not in a museum.
Oh...if you can, go for the first flight of the day. You'll get a little more time in the plane, as they warm up and run up the engines.