Soooo.... I've tried many, many times, and "/warp shop" doesn't work for me. It always says "Error: That warp does not exist", so I'm not quite sure if I'm just missing something, or if I'm just an idiot and doing it wrong, but yeah, this is a thing.
That warp doesn't exist anymore. It should be deleted. Everything is done now via the Global Market. More info is here Welcome to Global Market