Hi - I run BTCDeals.com -
One of the suppliers I use is indeed DealExtreme. I do add a slight markup on the items (but if you do the math on most items, it's very little) for my time, overhead and risk - but mostly I run BTCDeals.com as my way to invest in to the bitcoin market. I cashout the value needed to cover my costs, while all profits I leave in bitcoins in a separate wallet that I keep as an investment. I'm pretty open about how I run the site and am more than happy to answer any questions (except the full list of suppliers I use)

It may seem obvious to just order directly from DX, but the service I intend to be offering is a way to purchase items with BTC instead of your personal currency and utilizing your bank or paypal accounts.
In the end it's up to you, the consumer - just trying to help fill a void in the bitcoin market, and obviously help myself be part of the bitcoin economy.