crafted gear and jewelry are not often sold on guild stores. You should ask someone to craft this for you and offer to pay them for their effort. Because these things are tailor made, it is better to ask in zone chat (better in a guild chat) if there's someone around willing to do it.
PC EU DC D'aryn, Breton Magblade DC T'agwyr, Redguard Stamblade EP B'eryth, Nord Magsorc EP K'ewan, Nord Magplar AD L'adaryel, High Elf MagDK AD S'eladiel, Wood Elf StamWarden DC D'evyn Imperial StamDK DC G'avyn Breton MagNecromancer
Just checked Tamriel Trade Center and saw only 3 listings ranging from 140k - 196k.
Edit: I didn't specify any trait when I did that little search. Given the limitations on selection that this adds to the mix, @Aragorn79 is right and it would be a great choice to have someone make it for you. Many crafters will make a single item like that for free if you ask nicely and can provide all the mats. If you're short of any required mats, buying the specific mats is an option.
Ask in your guild to see if any crafters are available. Be sure to have all mats ready and a nice tip if they are not asking for anything gold wise. You will get things done faster if you offer gold and all the mats up front in your guild chat.
I can craft them for you in any trait. I don't want gold, just the purple upgrade mats. Message me in game if you don't have a guildie who can or will do it. I'll be back on in the morning about 7 am MT US.