I know all companies have stopped producing them now. Try some dj stores, dj's like them, shame about everyone else.

I didn't even know there was such thing... here you can find only 90 min, 60 min or 45 min tapes Bah, why am I whinning, here CD's are cheaper then cassette tapes

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they sell them in hmv's in canada...i'm sure of it...even tho cd's have sorta replaced tapes..nothing comes close to being able to put a full essential mix on a tape.

They sell 120 min blank tapes anywhere in a musik shop. Try HMV or Tower Records, The WIZ, VIRGIN megastore or Sony online. I think amazon might have some....these should.
By the way, they suck. They get stuck within a few times use and they break. Bah, I gave up on tapes a long time ago. Sound sucks. I only use them for the gym and sometimes my car. Good luck.