Yeah, I think Ikea discontinued it, but there are third-party companies that make slipcovers for Ikea couches, if that helps. I've used Comfort Works before, and like them.
If you're looking for the sofa itself, that's trickier. I've had good luck with Kijiji, although Facebook marketplace might be an option if you're so inclined.
Otherwise Ikea has lots of other similar sofas.