Teatro Barcelo sells presale tickets before some of their bigger shows or nights.
Tickets generally start between 12-26 euros ($15-30). Expect to pay more for bigger name DJs.
Teatro Barcelo gets crowded and shows can sell out, so if you definitely want to attend we would recommend buying tickets.
Ticket holders get quicker, expedited admission as well.
You can buy tickets through the Discotech webapp.