Rock Concert DVD's (http://www.rockconcertdvd.net/shop_tienda/index.php)
This looks like a pretty cool site for Concert bootlegs. I haven't even had time to go through it all. There's so much to browse through. I don't know how they can sell all these and not get shut down. No idea how long they have been in business or how reliable they are, but if I find something I like I may pull the trigger on it since they are dirt cheap.