Most Supertrooper helmets will need to be painted to match your armor. If you want one in white though, Animefan ( AF) makes/made a resin white one without a dent. That is what I use but I had mine painted. You will need to reinforce the front of it with something or secure the visor with screws to help hold the shape. It will distort in any warm/hot temps without without it. Also if you have a large head it may not fit- it is smaller than the typical fiberglass ones.
Bobamaker also sells an undented kit but you will also have to paint it as well. I don't know the size of it either but he also has a fairly long wait time.
Agreed, I got a bunch of "stands" aka wood paper towel holders in this week. Need to make a top for them so the helmets don't teeter and paint em black.