Personall build save box - save up 3-5 builds (traits, gear, skills). Not usable in WvW outside of spawn point. Price: you can give it for 10k gems and still I will buy it. SAB acess pass: all worlds!!! Make it like stand alone dlc , or like build box for 10k gems. I think that there is some items where price doesn't matter, because ppl will want it what ever it cost. Memory return device: this device will set you back in time to LS1. (Battle for LA...) Theese items can have high price for your high effort to make them.