The Seminary did technically have tuition, but most seminarians found benefactors to sponsor their stay.
When I was there the "tuition" (which also included room and board) wasn entirely nominal (maybe $2,000 per year?) In any case, I had it easier where my parents sponsored me, though I had enough saved away to pay for it myself if necessary.
BUT ... I had always disliked the whole system of seminarians being asked to find sponsors and benefactors ... because seminarians would feel bad about letting down their sponsors if they didn't make it through to Ordination. I think that the Seminary should have just accepted donations in general (a benefactor fund) and distributed the money according to need. "You spent $8,000 [or more in later years I'm sure] sponsoring me for 4 years ... but I'm not going to finish, and so you kindof just wasted $8,000." That was never a particularly healthy dynamic.