The current status is that it mostly doesn't exist outside OEM parts. Searching an online retailer for ECC brings me hundreds of results for "non-ECC" RAM. When they occasionally have 1-2 products with ECC, they aren't as aggressively binned as the non-ECC sticks. They'll have higher latencies and lower clock frequencies. Basically: you'll need to accept gambling on being able to overclock your ECC RAM.