I just have a pair of hiking boots that I wear indoors. I have them laced up very loose so that I can just pull them on without undoing the laces, almost like slippers. They're very warm and comfy.
Dunno if these fit your needs, but this is the pair I have. Had them for maybe 6 or 7 years (light use, mostly just wear them indoors) and they're in great shape. Solid rubber sole, super warm, very comfy. I feel like they run small (I had to get a size up from my usual). Only gripe is that they had a tag on the inside that was tough to cut out cleanly.
For what it's worth, they are also available on Amazon. I'd be willing to guess they're available on other online stores, so all hope may not be lost for you.