Pshm it will probably run you $200 TOPS
$130 or so for the clammy itself, then you can transfer everything from your Classics frame into the Clammy, you can even use the same trigger i believe.
www.paintballkingdom.com sells Clammshells. so do alot of other sites, but PBK is FULL of Certified Timmy techs. and they are great guys.