not only can you get a student tickets for the cup games but the prices are gone up for adults:
from citynet:
Tucket details for Derry Cup Semi
The FAI Cup Semi-Final against Derry City will take place on Friday, October 4th at 7.45pm at Turner's Cross. The clash will be an all-ticket affair. Tickets will cost 10 for adults and 4 for Under-14s. The tickets are printed by the FAI, who also govern the prices. The tickets will be on sale by next Tuesday at The Evergreen Bar, PJ Turner's Beergarden, Lough Tavern, Lough Laundrette, Lennox's Bandon Road, and the following Cashmans outlets: Maylor Street, Douglas and Dillons Cross.