Amazon.com has the Ultrasone Pro 900 for $306.80. I bought Sennheiser PC350 for a lot cheaper than retail on Amazon also. Anyone know why they are so cheap on Amazon??

Hey guys this is my first post and I hope to get some good information from this forum. Here are the circumstances.   I will be in an office environment so I can't have any sound leaking.   I listen to rap and hip-hop with some electronic.   My budget is around $400-500.  ...