Edit : It’s not a bug! I was just out of the loop on this one. You can buy everything but the ilevel 277 weapons and shoulders without an arena rating. Thank you for pointing this out Mageshadow & Jack!
I just found this out and thought I would get a post up about it as soon as possible! Many believe this is a bug, so they may fix it soon, but as long as they don’t take away what you purchase, it will be totally worth taking advantage of! Nargol Lashcord in the Sewers of Dalaran is selling off his wrathful gear that usually require 1800+ arena ratings, without the rating requirements! The items are grayed out as if you cannot purchase them, but you actually can! The prices are really cheap as well, the shields and off-hand items are only 70 honor, the wands and librams are only 260 and the off-hand weapons are only 760! The only item it seems still requires the rating are the shoulders.
I recommend grabbing up whatever cheap gear you can use for your pvp set or even just to get your alts some decent gear! I will be pvping as much as possible to try and save up the 2600 honor for the 2 handed sword for my pally before they fix this possible bug!!!
Time to get back to it!