Yup, you read that correctly, a Gitzo magnesium center ball head for $24.95.
But wait, there's more, it also has free shipping! (sorry, but this offer does not come with any Ginsu knifes, pajama jeans, or snuggies)
This is not a mamby pamby ball head, it will hold up to 8.8 pounds and considering a Nikon D3 weighs under 3 pounds I can't imagine any body/lens combo that would exceed the weight limits of this ball head.
Now as usual the devil is in the details, the final price for this Gitzo ball head for $24 after an $80 rebate. The current Adorama price is $109, they give an addition $5 off during the order process, and then the $80 rebate brings the final price down to $24. Again, there is free shipping on this item as well.
You can find the product details here and information about the rebate (including the form) here.
The rebate is good through February 28th (of this year).
Did I mention the free shipping?