I'm with Bang Guy on this. I mean, I'll order some middle "filler" LR online, but I always handpick the pieces that go in front and on top from my LFS. It's worth the price to me
But I'm extremely picky. Everything has to be *just* so. You could do like I do...I mean, from online you get a lot better prices, and still get the filtration....and then you can hand-pick some prime pieces from your LFS.
Someday I'll move my hurkin colt coral and take a picture of my favorite piece of LR. It's a large piece of fairly solid tonga, so it cost a pretty penny, but within weeks it was covered in orange, red, purple, pink and green coraline algae and sponges. (It was a substituted rock shipment, they typically only carry fiji, but their distributor was out so they sent some fully cured tonga in lieu since they'd been out for months) It nearly reaches my water line and it's got holes big enough for a medium sized Marine Betta to comfortable idle in. If it wouldn't disrupt my tanks' little world, I'd move it out from behind the colt coral (It was nowhere big enough to hide this rock when I got it...but since then it's nearly grown out of the tank.
Anyways, before I started drooling over my own rock lol I would have paid more than 10 dollars a pound for this rock if they'd been asking it. (Even though it weighed 18-20lbs or so...I know, horrible memory lol) Sometimes you just see that rock that you *have* to own...no matter what the cost. (Well, if you're a freak like me lol)