Here is a link for the AH300 horn in the OMA speaker.
http://www.acoustichorn.com/products/300/
A pair of these horns is $2700 in plain maple with a small upcharge for other woods. I believe I paid an extra $150 for cherry.
You can have the aluminum horn throat customized for any driver you wish to use at no extra charge. The B&C drivers that I use sell for around $1100/pair. These numbers are not chump change but they really are a bargain. I combined my horns with a pair of JBL L-200 cabinets (usually $1000 - $1200 per pair used) and a DBX Drive Rack PA for $400. Beyond this, all you need is 2 amps for bi-amping and some time, effort and experimentation tweaking the many variable settings on the DBX. If you do the math, you'll notice you are pretty close to 10% of $53,000.
You may notice I didn't mention a tweeter. That's because you probably won't need one but the B&C driver is a coax and there is a concentric horn tweeter included should you want it. That can be crossed in passively or you can add a small amp and tri-amplify.
The performance level of this speaker will blow your mind.