I can get #73 limestone here for 13.50/ton delivered. That is what I used on my driveway. I had a dump truck for a few weeks, and I picked up 80 tons. Picked up price was $12.00/ton.
I used 60 tons on the drive, and really should put down another 60 tons to finish it. #73 has the fines in it and it packs down really well, it's like concrete under the surface layer.