Here's a good article about state laws that give illegal aliens college tuition at the in-state rate. In other words, illegal aliens pay lower tuition than out-of-state citizens:

At California's state universities, in-state students and undocumented aliens pay an annual tuition of $1,839, out-of-state students pay $7,380; at the University of California Berkeley, in-state residents and undocumented aliens pay $3,859, out-of-state students pay $15,000...

The advocates of this discrimination claim they want undocumented aliens to get a college education so they can become productive residents. But undocumented aliens cannot legally hold a job in the United States.

Let me put that in a clearer format:

at state unis:
in-state undocumented aliens: $1,839
out-of-state citizens: $7,380

at UCB:
in-state undocumented aliens: $3,859
out-of-state citizens: $15,000

For the state unis, a citizen pays $5,541.00 more than an illegal alien; at UCB, a citizen pays $11,141.00 more than an illegal alien.