If you've no longer got the technology to make a mix tape any more, perhaps this cassette cookie cutter from Urban Outfitters could offer some form of replacement?
It's an intricately shaped cookie cutter to help you shape a cassette-shape out of your favourite biscuit mix. Plenty of scope for customisation too, whatever your musical or food flavour of choice, and the finished gift is almost (though not quite) as romantic.
The cookie cutter is available for £10.
See it online