I say go for the stuff
www.bulkreefsupply.com has. Even if it works out to $5/lb (and it does) you have to remember that it is DRY WEIGHT, so 50 lbs of dry base rock is WAAAAY more rock than 50 lbs of wet live rock, so the savings is quite a lot. Also be aware that it will take several months for the dry base rock to blend in with the live rock.