I got mine today at a flea market of all places. After scouring all over for one and finally about to give up and order it online, I'm walking around this massive place today and come across a guy selling phone accessories, and low and behold, one Defender case for the Samsung Captivate in a sea of iPhone cases. $40 tax included and I was a happy man at last! Good thing too as I've already dropped my Cappy. Luckily no damage but a little nick on the corner.
The design and feel of the case is great, IMO. I love the feel it gives in your hands, definitely feels substantial and sturdy. It fits like a glove, but does hinder the soft keys, especially with a screen protector. I was having all sorts of hell with it at first with the screen protector I had, so I decided to try out theirs. Well that didn't go over too well and I had lint all over the inside of the screen (thank you dogs!), so needless to say I am going commando on the screen. That really helps with the buttons on bottom. I just hope that Gorilla Glass really is tough as nails!
Overall, I love it. I do wish though that the rubber skin locked in better like on the iphone, but what can you do?