I just bought suet for the first time today. At a farmers market last weekend, which is held at a place where they raise 100% grass fed cows, I asked some of the people selling meat if they knew where I could get suet. One of them referred me to a family owned processor, the same place that slaughters cattle for farm I was visiting. He said that they should have some grass fed beef. When I called them and asked if the suet was from grass-fed cattle, the person on the phone said "yes, it's mostly pastured beef, it comes from local farms in the area as well as our own cows" asked again then if it was grass-fed, and they then said "Some of them get some grain" which makes me frustrated. I bought it anyway, 5 pounds for $5. When I looked at it it was white, but the chunk that I ate from had some pink tint towards the center. Does the pink color mean anything? I'm going to render some to see if it's yellow or white, maybe tomorrow if there's time.
About a month ago I called and emailed around to some grass-fed beef farmers in my state, a bison farm said they would have suet in the summer. I'm yet to call them about the suet, they are quite far away, though I guess I may end up relying on them anyway, since most other places said no or didn't even know what suet is.