This is something that is obviously very university specific. Honestly, I'm shocked you can't. I've never heard of a university not offering SPSS to grad students. I think most even offer it to undergrads. You usually have to pay for it, buts its nominal (10-100$, and I still consider $100 nominal compared to the 1500 or whatever it costs if you buy it on your own). Best point of contact would probably be your advisor, they can probably direct you to who in the administration you'd need to talk to about setting something up in the budget for this.