I agree with mel. I will buy my LR at my LFS, but I am buying 150Lbs of base rock and will seed it with LR of my choice. I like to go and pick pieces of LR that look neat. Definitely check your regional forum to see where folks get their LR from. Buying base is a great way to save some money. I am buying 150Lbs of base, for a little over $2 per Lbs. Where I live, LR is $8.99/Lbs.
So 8.99x150=$1349.00. Ouch! I'll pick LR from my LFS (roughly 50-70Lbs) when I see really cool pieces.