$45K for the small engined one, IIRC, for the 7. The factory 5 one you re suppossed to be able to build for under $15, from what I read a while back.
From Factory Five's website a complete Cobra is $19,990 and you still need to buy an engine, transmission, wheels and tires. Not to mention getting it painted. A GTM is $24,990. Then you need;
Major Parts from 1997-2004 Corvette C5
Engine, computer and exhaust manifolds
Front and rear suspension components (minus leaf springs and shocks)
Front and rear brakes, hubs, calipers and rotors (outer CV joints on rear)
Fuel tanks and flexible lines uncut
Radiator w/fans and plastic shroud
Wiring harness w/engine, throttle control, & ignition sections
Wheels and tires
Minor Parts from 1997-2004 Corvette C5
Tilt steering column and ignition switch
Flexible brake lines and calipers
Radiator fill tank
Wiper motor
Oxygen sensors (4)
Exterior door handles, door window mechanisms, and side/rear view mirrors
Seat belts
Vehicle speed sensor
E-brake handle/cables, gas pedal
Hood latches w/ cable actuator
Other Parts Needed
Porsche G50 or G50 variant transmission including clutch disk, pressure plate, throw-out bearing, inner CV joints & starter or Mendeola 5 speed transmission
Now, the Caterham Super 7 I mentioned with the GSXR1000 engine and sequential gear box is $64,950 CND.