I am planning on going to scale rc helis and want this fuselage http://www.scaleflying.com/product_p/kf-ah64g5.htm

Why do fuselages cost so much?, and what 500 size heli would fit, and what other accesories would be needed?

WTTB...

Looks like a nice project. Not sure about the cost, seems reasonable to me given a quality fuse and a Boeing licensed product as well (never seen that before!). Given the effort that goes into producing a quality product and the number of sales expected, to me $299 seems reasonable. It looks like Trex mechanics will fit so I'd go with that option if you can.
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From the website:
500 size Apache
<span style="color: rgb(0, 0, 255);">Fits RC Aerodyne FFH 500 size mechanics
Trex 500 </span>
Epoxy and carbon fiber fuselage.
CNC Aluminum Landing Gear with working struts.
Includes weapons set
Everything you need to modify your 500 size heli to the raised tail system.</div><div>
Note *</div><div>Upgrading your motor and ESC may be needed due to the complexity of</div><div>the fuselage. This is even more important if you choose to use a multibladed</div>rotorhead.

thanks for the reply would it be needed to have a four bladed rotor head and four bladed tail rotor?

the multibladed head and tail are only options, not necessities