Here is the BOM for now:
Quadcopter: Outlaw 270 (125 USD)
Receiver: Orange RX R618 XL (10 USD)
Controller: Spektrum DX7s
Computer to controller interface: Arduino copy (5 USD/board) with PPM cable made from an audio cable.
Otus tracker, base stations and software (2180 USD)
Spare props (About 10 USD)
Sport netting (About 100 USD)
Laser: 500 mW purple (30 USD)
Glasses: Jtech Photonics (3x 25 USD)
Black Balloon: (Dollar store close to Halloween or Amazon)
PWM controlled relay (8 USD)
Total: about 2500 USD + transmitter (100 to 500 USD), including the quadcopter and the motion capture equipment.
Most of this is reusable for many other projects if you have a quadcopter lab.