your best bet is Armamentaria. They sell imported helmets but have a very good quality control and don't sell the really awful ones you see on ebay that have so many errors you might as well wear a tupperwear bowl on your bonce and write 'property of the emperor' on it.
. A delicious decadent historical trifle. Thick performance jelly topped with lashings of imaginative creamy custard. You may also get a soggy event management sponge finger but it won't cost you hundreds and thousands.