It seem that most states give instate tuition to illegals.
http://www.numbersusa.com/content/learn/dream-act/map-states-state-tuition-laws.html
Actually, the number is 13 which is clearly not 'most'.
State Actions
In June 2001, Texas (HB1403) was the first state to pass legislation allowing in-state tuition for immigrant students, followed by California (AB540), Utah (HB144), and New York (SB7784) in 2001-2002; Washington (HB1079), Oklahoma (SB596) and Illinois (HB60) in 2003; Kansas (HB2145) in 2004; New Mexico (SB582) in 2005; Nebraska (LB239) in 2006; Wisconsin (A75) in 2009; Maryland (S167/H470) and Connecticut (H6390) in 2011.
States that have barred unauthorized immigrant students from in-state tuition benefits include Arizona (Proposition 300, 2006), Colorado (HB 1023, 2006), Georgia (SB 492, 2008), South Carolina (HB4400, 2008), and Indiana (H 1402, 2011).