I believe BLMA and Gold Medal Models both offer photo-etched lift rings. I've used the BLMA ones before and they're quite nice.
Apparently BLMA did make some. #BLMA 90. Just checked the Atlas/BLMA pages. That number is not shown.
Well darn, I hope they're not discontinuing them! But it looks like they're still in stock at several online retailers currently.
I found them they are the Grandt Line old part number 108 and came in a small pack with three sprues that had three different sizes,
Do you have a link? Since Grandt was sold to San Juan Models, a lot has been discontinued or is not currently being produced.