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I contacted Auralens, they replied - "Our AGW-300 filter is the replacement. The AUR-99 material is no longer available; we exhausted the last stock of the glass a year ago."A good pair of welders #3 safety glasses is all most chaps need for hobby forging.
Didymium glasses were the ones recommended years back. They are used by glass workers and others. However, they aren't the best choice for our forges. We deal with a high amount of IR as well as UV. Glass workers are dealing with sodium flare (IR and UV plus bright light) which is very bright in light output. The didymium stops that, but isn't as good in the darker work areas of a forge. It is harder to see the temperature of the steel by eye with didymium.
The current forging glasses I use when forging for a long time are Auralens AUR-99 . You can get them in prescription, bi-focal, even clip-ons. You pick the welders shade desired 2.0 through 8.0. I use a #3. Cost is much better than Didymium, too. I think Auralens is now called Aura Visual Concepts.
$310 for the non RXThe AWG-300 is a superior lens, but it used to be about two to three times the cost. What are they charging now?