Try? Like this one? (7350K ES, one you did not list)
Personally, I would never buy an ES chip. I get these CPUs from Intel's partners so I can complete my motherboard and memory reviews here on TPU. I'm one of those people that are supposed to have this type of chip. I still have every one I was given.
Intel's policy on ES CPU are pretty clear; they are not for sale, and you should never buy one. Intel has a page explaining their position on these CPUs:
http://www.intel.com/content/www/us/en/support/processors/000005719.html
As you can see by the bolded part, there are times when ES CPUs are given out under other circumstances. If you have one in a prebuilt PC, you should ask for a real CPU, that has a warranty. This is why I will not buy one, and recommend that you do not either; this CPU will have no warranty, and should it fail or not work, you do not really have any way to get a replacement in the proper fashion. That is why on the "grey market", these CPUs will be to be very "affordable". But to me, not having a warranty is not affordable.
Do not buy.