Divoza is amazing they have stores in holland and they do ship to nearly everywhere.
If you want a website SmartPack is bae❤️ But if you are ok with driving, go to a local tack shop because almost everything there is half the price of Dover
Sstack.com or patchworkpony.com
a good website for good looking, but cheap helmets is troxel. They have some wacky designs at first glance but they also have nice show helmets for only around $100, they look like Charles Owen helmets, just with a troxel logo and they work just the same.
Horseloverz.com & chicks saddlery are inexpensive but good quality!