Hi There. I saw your complaint about the White Centurions and wanted to help. As it turns out, when they are finally released, you have to click "refresh" to see them listed to buy. If you don't click refresh, then you will never see them go on sale. So that is why you never saw them go on sale.
Hope I helped so you can try and get some next week!
Hope I helped so you can try and get some next week!