Oh, that's a relief, mom. An iPad would be very hard to cram down in a pocket, so that's an argument investor of the larger format.
By the way, for your purpose, you only need the WIFI 16GB version and I suggest you check out the Apple online education store. There might be a discounted price.
Investor = in favor
As far as I can see there is no educational discount for the ipad only imacs and maybe ipods I believe. There are already refurbished ones for $449 though, not much, but $50 is $50.