Intel never really intended to drop the price of the 320 series. They're not discontinued, nor have they been replaced or superceded by a newer product. The 330 and 520 series are not replacements for the 320 series, as most 320s are going into larger enterprise deployments. The 320 is the only client drive on the market with power loss protection. I actually just bought another one today for a specific use which burns my ass because they're absurdly expensive.