Dear Aline,
The UF Purchasing website (http://www.purchasing.ufl.edu/main_hints.asp) has information on how to purchase an Apple computer.
Faculty, Student and Staff Personal Purchases (Non-UF Funds)
For APPLE Personal Purchases for Faculty, Staff and Students, please visit The Apple Store at the UF Bookstore
The purchasing site also offers this page on purchasing personal items from Apple with an educational discount: http://www.purchasing.ufl.edu/main_contracts-apple.asp
The contact person is:
Kevin Hodges
Apple's Education Division
khodges@apple.com
800.800.2775 x46552 (toll free)
512.674.6552 (local)
866.261.4104 (fax)