Your friend can buy a computer for you using his education discount as long as it's not the same kind you want to buy or he didn't use the discount for the computer he bought within the last calendar year.
can't you just use an campus store URL and order it yourself with discount and the ipod? Here in NL lots of people do so and I have *never* heard of apple verifying even one of those purchases.
These orders all just go out at the discounted price even with ipod rebates. There are even forums here comparing the different store URL's to find the one with the highest discount (found a 12% discount URL for my own order).