There are also many articles on making your own live rock. I now make my own and do not buy live rocks anymore unless there are coral attached...LOL
The curing process of home made live rock (or I should say soon to be live rock) is a fairly long time......but in the end, you save the reefs and you have something that you made yourself in the tank. You also can "sculpt" the rock exactly the way you want to, so that you can aqua-scape your tank to perfection.
I currently have about 60 pounds of Sparkymade rock in my tank and another 60 pounds curing in the garage. It took about 4-7 weeks for the home made rock to start getting covered with coraline algae but you can't tell the difference between the rock I bought and the rock I made.
If you are tight for money, and have the time to wait, you can do it this way. Making your own rock is really cheap. But, be forwarned........you MUST cure it correctly BEFORE it goes into your tank. If you don't have the time AND patience this is not for you.
Hope this helps you out some.
125 Gal-35 Gal Wet/Dry-Tetra-Tec PF500 HOB
(3) AuquaClear 301 Powerheads-600 GPH
Automatic Tempature Controller
5-6 Inch Sand Bed-200+ lbs of LR