110 minute cassettes are still more reliable then 120min tapes.
You do have other options tho, like streaming the radio station on your computer and using a program to record it (would be the cheapest option).
Or buy a
c.crane VersaCorder, it can record 3:30 minutes of talk on each side of a 110min tape, the good thing about this recorder is that you can program it to stop in between commercial brakes.
But if money isn't a factor, I would recommand getting a
MP3 recorder w/ build-in AM/FM radio instead.