yeah ebay eBay Motors: 12.75" Brake Upgrade for 240SX S13/S14 w 300ZX calipers (item 190015524502 end time Aug-11-06 08:06:10 PDT)
price seems a bit steep though, id rather fab it up myself
i found this site if aswell Fastbrakes.com
they have some decent stuff, but you could piece together your own kit for 150$ cheaper, q45 calipers new 180
rotors drilled/slotted 100
hawk hp pads 66
SS lines 45
= 391