I have no idea how far North they go, but Lanes fertilizer on 69 just North of Lindale is where I was told to go by my neighbor, who uses them every year on his pastures.
https://www.yelp.com/biz/lanes-fertilize...urce=duckduckgoWhen I went there, they told me that they where already sold out of lime. My food plot is half an acre, so I wanted one ton to get the 2 tons per acre coverage. Buying sacks seemed expensive to me, so I started calling around and found a place in Gilmer that said they had a ton laying on the ground behind their building that I could buy for cheap. I forget what I paid, but it was worth the price to shovel it into the bed of my truck. I also forget where I got it, but it was some sort of lumber yard, maybe an Ace Hardware? That was ten years ago.
The following year, I sent in a soil analysis and was told that I needed a half ton of lime per acre and that I was very low on K, or Potassium. So I bought thirteen 40 pound sacks of lime and about the same number of 13-13-13 fertilizer, and then several sacks of something like 2-2-35 fertilizer. That's not exactly what I bought, but it's a good example of what I remember doing.
I had really good results from my food plot after that and haven't done another soil analysis since then. Now when my food plot begins to die when it gets hotter out, I spread ten sacks of lime and five or six sacks of 13-13-13 fertilizer over the area and disk it in. I've tried a few summer food plots, but it's just a waste of money. I've had some fun with wildflowers, but that had nothing to do with attracting the deer. This year, I'll probably just leave it bare and spray for weeds once or twice, then disk it up in September and plant once the heat breaks.