Some of my GoTo Vendors

Framers Inventory, picture molding and framing materials supplier.  
​Portland owned and operated for framers only

Larson Juhl, picture frame supplier Ideas and Inspiration
There are lots of interesting ideas and concepts posted on Larson Juhl's pages

Roma Molding, picture frame supplier of made in Italy moldings

I also carry Nurre Caxton, Nielsen Metal Frames, Omega, Picture Woods, Munn Frameworks, and several others

Closed Corner (Museum frames) I carry APFMunn, AMCI, C & J Picture Frame lines.  If you look closely at these frames there is no visible corner seam and they are often hand carved.  These frames are built to my client specifications:  different metals, colors, depths, rabbit depths and can be infinitely customized.  They also take four plus weeks as they are built from scratch.

Below are just the tip of the closed corner iceberg of frames.
in this case I used the C & J site as their pictures were generous and large enough to see details.