I have several perennials for sale. This is a great time for transplanting!
These are all shade loving. None are in their prime right now as reflected in the photos. (Photos are in the following order:

Bell Flowers-mounding evergreen. Will spread but not aggressive. Send out runners in June covered in blue flowers. There will be sporadic blooming through the summer if you leave the runners. Multiple plants available,

Cranesbill hardy geranium- These have a small purplish flower in spring. They will get about 24" tall and at least that wide. I divided mine after a few years. So they are not aggressive at all. Multiple plants available.

Hardy impatiens- These have very insignificant yellow flowers in late summer. The leaves add texture to a shade garden. They will spread fairly quickly. I just thin out my edges each spring or fall to keep the shape I want. 4-5 starts for $1.00.

I also have some Lily of the Valley (no photo). They will grow under large evergreen trees in deep shade and are fragrant when they bloom. They will spread.