There are no QFs. There is a super eights stage out of which top four play in the semifinals.
The cheapest semifinal tickets were $25 when I bought them in February, and they are going for $200 now and maybe $2000 if it turns out to be Ind Vs Pak Semifinal. (My own little GME trade!) If interested, be sure to buy the SF in Guyana and not the other one since should India make it to the semis, they will be playing in Guyana.
https://tickets.t20worldcup.com/selecti ... y40MC4wLjA.