hardly anything, old mellanox NICs are practically free on eBay, DACs and 10g optics are a pittance. Even DC 10g switching is cheap.
Franky, 100ge is within home budgets now.
If synthesisable MIPS cores from R3k to R20k enter the public domain, that would be something special. based on how previous such "announcements" have turned out, it's not gonna happen this time either.