They've dropped enough that it's cheaper for us to purchase all 1TB SSDs to replace our 650GB 15K SAS disks in our SANs, after two years our drive failure rate has dropped by nearly 900% with a 5-40x performance gain depending on what you're measuring and the drives are about half the price of what the 15k SAS drives cost, to top it off our SANs used to run so hot you could barely touch the rear or the servers and now they're dead cold 24x7.