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Uruguay recently published a fairly detailed breakdown of Plan Ceibal - their 1:1 laptop and connectivity program. In their case the hardware (XO-1's) cost $188 and the TCO over 4 years (calculated after 4 years had passed, not just projections) was $400; making hardware roughly 45% of the total TCO. And this deployment was extensive: including costs of broadband connectivity to schools and residential areas, teacher training, digitization of existing materials, development of new digital materials, accessibility programs for disabled students, and repairs. One lesson from their data is that at very large scales, hardware costs matter much more -- are a larger fraction of total implementation for high-quality implementations -- than at medium scales.