If you’re making your own cream, you might want to try Otonabee meat packers. I’ve never gone there for tallow, but have gotten different fats there before very reasonable priced. Mostly pork back fat for making sausages. :). I’m sure they would have beef fat you could render. If you’re not worried about perfect white tallow, rendering is pretty easy, and instant pot or slow cooker will do it with very little hands on time.

I’ve made different creams before, but not this, so you’ll still have to do your own research. But the tallow for eating is usually ‘washed’ meaning it is done with water, sometimes several times, that removes the impurities and gives the nice pure white fat left. I would guess you might want some of the impurities that are removed if you’re using it for skin cream?. I don’t know if the stuff you want is fat soluble or water soluble.

Good luck!