Quoted from Slim64:
I've been watching lately, there is an ECLE in Texas for 7k. A RR in west Virginia for 6.5k. An ECLE just sold in Wisconsin for 7.2k.
You can probably find show special standards for pretty cheap too, I wouldn't pay anything over 7k for a HUO standard personally.
It'll come down to how much the warranty is worth to you. In some ways, the savings of buying an older light board model is still more than buying a full new set.
I bought the WOZ RR edition in West Virginia, picking it up in a couple of weeks. I believe it has the 7.5 boards. Build date is 10/01/14