Where can I find sofa slipcovers for the Ikea KIVIK loveseat?

I've been trying to find websites online where I can purchase a new slipcover for my Kivik loveseat from Ikea. I have only found one website (bemz) and the covers are way too expensive. Ikea doesn't offer a very good range of covers and fabrics either. Anyone know where I can find some? Anything helps!