I think I bought my last ones from Wesspur, though I'm not positive. I have bought quite a couple off Amazon. The last couple I've bought are okay, as far as the cube itself is concerned, but the holes in the corners are big enough for a stray cat to get into, it seems. I am exaggerating, for sure, but a loop (or four) of throw line is always hanging out and grabbing on other stuff. Why in the world they felt the need to make those holes so big is beyond me.