Since you're r36, you can also consider getting into a party and killing some of the low level NMs that drop shields. Gluttonous Gertrude drops Shield of the Savage, and Slippery Sikes drops Thalassian Targe.

I can also confirm that some of the faction leves give shields as rewards, but they're usually the "Dented" type that need upgrading to Vintage (like the Notched Buckler).

Gotta admit it's great to see folks setting goals and making challenges for themselves. Have fun!