I was just at my local BevMo and it looks like they have put all Riedel stems on closeout. This particular store had:
BDX & Burgundy Vinum stems - $20 per
Several Vitis styles - $30 per
Several Wine styles - $12 per
They have a few things on the website, but much more in-store. Happy Hunting!
the only thing that would make the Vinum prices good is if you can buy individual stems, rather than a 2pack or 4pack, otherwise, those are standard per stem prices.