I'm on the lookout for a dual tray 661-5708 to upgrade a single 2012 5,1. Looked on eBay and only found a faulty one used and new from the US is about 800 bucks shipped to UK. This is for my own use, the 2012 is in excellent condition and considering it to replace my 3,1 dual 3,2 and I have to work out the cost or whether it's worth hanging on for a native dual socket cheesegrater. If anyone knows of one being sold anywhere let me know please, will happily take without CPUs and fit my own. I'm uk based but will buy worldwide.