I just bought 80lbs of aragonite sand from this link for $60 shipping included.
Aquarium Sand | Argonite Sand | Dry Live Rock - Marco Rocks
I went with the coarse sand and am happy with what I got. It's not graded however so you get a mix of different substrate grain sizes from sugar sand all the way to the caribsea special grade.
I used a kitchen strainer to rinse it off and it separated the sand into these 2 grades.
Overall, it's more work in cleaning than the caribsea aragonite sand but if you are buying a lot of it and are worried about money then I would say it's a good purchase.