Re: Molding Source of Supply
This comes from the school of "give a man a fish -- he will eat for a day: Teach a man to fish -- he will always have food."
The streight-forward "modern" square stock is perfectly easy for a DYI with some woodworking experience, and a few power tools to do.
I think the whole idea with framing is that
1) It looks better to the gallery. More professional.
2) It is "ready to hang."
But it also adds a huge charge to the customer. I can see in some cases that they are actually buying the painting because they like the frame. Using the simplest frame you can find creates a situation where the picture is the center-focus and not the frame.
The frame you mention: espresso colored plein air style with a gold liner would actually be fairly easy to make.
Making art since 1973-ish.