So far I have ordered four 12-oz containers of mutton tallow from Dixie, in two orders. The first two were nearly white, the second a little more yellow brown in color. All four smelled the same (to me very pleasant) and none have gone rancid. That's the great thing about the stuff; formulations with it can sit in a lubrisizer for months without separating or decomposing. The only "problems" I've seen are that it's rather pricey coming from Dixie and the supply seems to be very irregular. It has dried up for a year with no explanation, and then is suddenly available again.
I'd go for 5 lbs, depending on price.