The WRX intercoolers go for $50 - $70 without the Y-Pipe on NASIOC. The HKS Blow-off valves range between $100 - $160.
I'm asking $120 for the whole setup with Vibrant hoses & clamps.
More Information:
http://www.hksusa.com/products/?id=3261
Sound of HKS SQV Blow-off vale:
http://www.youtube.com/watch?v=Rdl6t6lIfEU
US & Canadian shipping available at buyer's expense. PayPal payments accepted. Local pickup in the Grater Toronto Area. No lowballing!
DETAILED PICS:
'03 WRX Intercooler - Left Side - Vibrant Hoses & Extended Turbo Pipe for EJ22T/EJ20G

HKS SQV Super-Sequential Blow-off Valve & Vibrant Hoses

'03 WRX Intercooler - Front

'03 WRX Intercooler - Right Side

'03 WRX Intercooler - Bottom - Modified WRX Y-Pipe to fit EJ22T/EJ20G visible

HKS SQV Super-Sequential Blow-off Valve Close-up

PM me with any questions.
Cheers!
P.