how much would a tree like this cost for the pixels and hardware without the spear
He said there are 24 strings each with 25 pixels. This probably means he is using 12x50 CCR's. Those are $250 each. So $3000 for the tree, another $500-700 for the sphere.
If you did it DIY
128 nodes string
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Login$50 each, fold into two strands of 64.
$600 and about $200 in shipping = $800
1 Lynx etherdongle $100
1 active 16 port hub $100
You should be able to build about the same tree for $1000