Zach....there is not really a standard.
I personally got about 30-40lb of live sand directly from the gulf and mixed with 40lb agronite. I got 80lb of LR
and am supposed to be getting almost another 80lb today. I know a guy who has the license to harvest LR
so I am going that route...may take more work and alot of water changes to get my tank stable but Im getting over 150 lbs of LR
for far less then I can get it from anywhere else please this rock is premium LR
with lots of life
you may read about some that mix 25% live sand and 75% play sand or agronite sand (if you can find the right play sand at HD
or lowes...thats cheaper)
I have seen most places the Base LR
is not much cheaper then the better stuff/premium...its all in what you want to do and can afford.
I found this guy locally thru ebay and so far the 1st 80lb is good...but its uncured fresh harvested LR
which means I have to do alot of water changes.