All the major UK sellers started selling again today but with this warning
Intel Sandybridge P67 and H67 Motherboards SATA issue. The issue has been raised that devices connected to SATA Ports 2-5 may degrade over time.Devices connected to SATA ports 0 and 1 are not affected and can be used as normal. There is NO issue with Sandybridge Processors, only P67 and H67 Motherboards are potentially affected."
It does not mention if they if they can be RMAed later or not.
Considering that the manufacturers are saying they'll replace them, I wouldn't think there would be a problem. If you have doubts, I imagine you could call the hotline for the manufacturer of the motherboard you might purchase.