Vivo Fencing Registration
Continuing students need to sign up with Vivo to become non-competing members of the USFA once a year. It’s only $10.
Since Vivo is a fencing club mostly for kids, you may have to fill in a couple of fields with placeholder values for weapon, be your own parent etc.
Purpleheart Armory is a great source for HEMA equipment of all kinds. The site has enough equipment to be a bit intimidating - if you're looking for practice swords the longsword page is what you want. The VB techniques feder and Italian feder both get good reviews and are inexpensive.
HEMA Supplies has Regenyei feders for longswords and many other weapons, as well as Sparring Gloves and a few other items.
For direct ordering of SPES equipment and especially custom orders SPES USA is a good alternative to Purpleheart.
Wild Geese Fencing’s stock is hit or miss, it’s a small operation which doesn’t get regular shipments, but what he does get is top tier.
There's a lot of bad interpretation out there, but there are a few people putting together worthwhile resources. The Illustrated Ringeck on facebook is a pretty nice set of modern photos that cover Liechtenauer longsword. Because facebook is a terrible place for information you'll have to scroll way back to start at the beginning.