I don't think there are any P67 Gen3 boards with PCI-E 3.0.
Are you getting mixed up with the B3 chipset revision?
Fair enough.
It does just seem to be their lower end boards though.
Ones which don't support SLI or proper x8/x8 CrossFire.
Gigabyte z68ap-d3 £82 or asus p8z68-v lx £78(was £72 but got so popular ocuk bumped up the price, will be going up to £83 from wednesday.