We buy single game tickets through the OSU Ticketmaster site or StubHub or Seat Geek. We try to stay w Ticketmaster (non resale) because the $ goes to OSU Athletics.
Your question prompted me to look at all 3 for that game.
Ticketmaster ONLY has Gen Admit ($5) w no reserved seating except through resale on Ticketmaster (which are pricey).
StubHub and Seat Geek have GA but for $11 and up plus fees so that puts you in the ballpark of $15-$20.
You can find reserved seating for $25 and up on these 2 sites.
Based on availability and pricing this looks like a pretty hot ticket. I’m not sure how many GA tickets are left, but at $5 per plus a small fee you can’t beat it. I would guess you would always be able to buy SRO tickets walk up but I’m not sure how that works vs a GA ticket. I don’t know if you can actually claim a bench seat w an SRO ticket.
GA seating is great at O’Brate (imo) if you get there early enough to snag a seat.