I am a collector of WW2 German visor caps and wearing them for my garden work etc.
I have ever purchased a white crowned U-Boat captain hat and a black SS officer's hat from Historybunker. Both are very nice and high quality reproductions.
Although it takes relatively long time, they say 6-8 weeks to produce plus shipping time, their products are remarkable, worth for waiting.
Historybunker is highly recommended and reliable UK manufacturer of military related products.
Hopefully, it would be better if they have cheaper shipping options for overseas.