I like Florida Frames. I mostly buy their traditional gold wood frames, which work very well with Raymar panels. If you buy three or more of the same size, they give you 15% off. I've used them in several galleries and plein air competitions, so I know they present the work well. They have both traditional and contemporary styles.
This one is my favorite for small paintings, and it's less than $20 per frame.
They have great customer service, I once had a frame damaged in transit, and they sent me a new one immediately.