From me looking around and asking a few stores around, vets still have it of course but is harder to get from them, was looking around for my own cat.

I doubt the efficacy of cat dewormer compared to ivermectin (mostly due to ivermectin being a human medicine being used for horses) as cat dewormer is probably exclusively for cats, but perhaps this is something that should be taken note of as apparently lots of people come to these stores every day to ask for cat dewormer despite them not being restocked in months

If you frequent a pet store yourself, see if the situation is similar where you live