$1,500.?!?!?!?!!!!!
I'LL do it for $1,500. all day long!!! What's your P.O. Number?? (That's a load of coin!)
Seriously, what Jim & Ryan said. A 125? So you're looking at what?? 200#'s??? (tank size x 1.5 = LR load) I've got a 120, with 225 #'s and it's a LOT of rock. Almost too much, really!
Shop the Base rock ($3-5/ pound) to establish your aquascaping foundation and then buy Top Quality LR to jump-start the Bio-bed and the "show" portions of the tank. Cycle as needed. You just want to cycle everything together. Avoid "adding" rock piece-meal. Do it all at once.
Also, shop for someone exiting the hobby or just changing tanks.
All kidding aside, I personally shelled out "a lot" of money for LR. In the end, I bought (what ended up being) 140 pounds of very encrusted 'shroom rock for (only) $500 (okay, it was a lot of money at the time, but what a bargin that ended up being.) Add to that, 36 pounds of mature coralline rock for $100 (thanks friedrice!), plus the 45# in my previous tank.
Add Caribe Live Sand (What? $40 / bag??) A 125? You'll need 4-6 bags?? That's still a far cry from $1,500. mate. Don't forget, the Rock goes in first and the sand filters around it. (I've also got a Sand funnel you can borrow to load the sand around your LR without creating a mess in the water.
Keep your eyes open and Shop it!