Here is a thread with some links:
I also do not know a source with all gilding tokens vanity. If i remember correctly most of the gilding vendor stuff is from the old version of the item shop, when those sets and solo pieces were sold for a very few funcom points.
But I am with Cynara on this one: Gilding tokens have a very high amount of value if you take real money as a measurement. You get them painfully slowly ingame, and if you buy boxes in the item shop to get them…that makes a vanity piece super super expensive. I would advise you to first look for vanity you can find ingame befor you go on the high cost journy of collecting gilding vendor stuff.