I was just looking round for the cheapest Macbook Air i could find and found this section on the apple website (seriously took me ages).
The prices for the base models are:
Macbook Air: £1031
Macbook Pro: £1104
Mac Mini: £359
Mac Pro: £1468
There are other discounts like you can save £150 on apple care. I know its a stor for higher education and that 'technically' you need to be a student but it doesnt ask for any i.d and if youre a student its perfect.