A little earlier this month, Apple
discontinued supplies of its 13-inch white MacBook (base) to educational institutions, which it stopped selling to consumers much earlier, last year. Apple has replaced this education variant of white MacBook with a new education variant of MacBook Air. The new variant will be offered to educational institutions at US $999 a piece, when purchased in packs of 5 (costing US $4,995), making it a viable replacement to the white MacBook.
The new MacBook Air variant is also a 13-incher, driven by Intel Core i5 ULV processor clocked at 1.60 GHz, with 2 GB of DDR3 memory, 64 GB solid-state storage (carried on from the 11-inch consumer base model of MacBook Air), but features the larger 13-inch display. Unfortunately, this model is only available to educational institutions that purchase in bulk (those packs of 5), and so the cheapest MacBook individual students can buy is the 11-inch MacBook Air.
Source: MacRumors