ArduCopter individual components - $524.38
* 1x Frame - Buy here for $150.00 (This Frame includes Power distribution board)
* 1x Power distribution board
* 4x Motors 850kv - Buy here for $16.00 ea. ($22 option available)
* 4x ESCs 20Amp - Buy here for $16.00 ea.
* 4x Propellers 10x45 - Buy here for $9.00 for 2
* 1x ArduPilot Mega Flight controller board - Buy here for $59.95
* 1x ArduPilot Mega OilPan IMU board - Buy here for $159.95
* 2x 3 row pins for APM - Buy here for $1.99 ea
* 2x Conn Header Male 36. Straight - Buy here for $2.25 ea.

ArduCopter Quad v1.0 KIT (I believe this kit includes the above components along with the GPS option 1 below)
* ArduCopter Quad v1.0 KIT, Full Electronics - Buy here for $499
* Requires TX RX and Lipo Battery

Magnetometer - More info

option1 - $46.85
* 1x Magnetometer - Buy here for $44.90
* 1x 15cm cable - Buy here for $1.95

GPS - More info

Option1 (Media tek) - $39.90
* 1 x MediaTek 3329 GPS - Buy here for $37.95
* 1 x 10 cm Cable (for GPS) - Buy here for $1.95

Telemetry - More info

Option1 (Xbee 900 mhz) - $130.80
* 1x Xbee pro 900 w/wire antenna - Buy here for $42.95
* 1x XBee-PRO 900 RF module - Buy here for $44.95
* 1x 900MHz Duck Antenna RP-SMA - Buy here for $7.95
* 1x XBee Adapter kit - Buy here for $10.00
* 1x XBee Explorer USB - Buy Here for $24.95

Accessories

* FlySky FS-TH9X 2.4G 9CH Radio (TX / RX) - Buy here for $59.99
* Lipo Battery - Buy here for $23.18
* Lipo Battery charger