Cheap magnetic tetrominoes

These bags of Tetris-branded magnetic tetrominoes don't look much good (it's obviously just a rubbery sheet with the shapes stamped out) but they are dirt cheap (49 for $9) and the street (you) will find its own uses. (very previously)

Are there any good magnetic tetrominoes? As in: each "pixel" a cube rather than millimeter-thick.

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