Sorry, I was on an airplane all day... I wouldn't be worried about the iPad popping out of the case, I just held it upside down, slipped my fingernails under the 2 edges of the backside of the case and shook it, trying to dislodge the iPad... It didn't budge at all, and I shook it hard. The corners have a little lip on them that snap over the corner of the bezel, it holds it really tight.
I got mine off of Ebay from a seller named nakedcellphone, but I just searched and he has an auction running, but doesn't have them in stock. He is claiming a shipping date of 4/28... Plus his price is higher than other stores people have been able to get them from. But when I ordered mine he was the only one that had them in stock, and I got it 2 days later in the mail. People at macrumors have been getting them at onsale.com and provantage.com... Check for stock there...
I couldn't be happier. The Incipio looks nice, but it covers up the front bezel more than the apple case does. It's going to collect dirt and hair under there, which is one reason I love this case. The full front of the iPad is available to wipe down...