Have you visited Breck's website (http://www.brecks.com) this week? Several plants are on sale. Take a look at the blue toad lily. Yes, blue and beautiful. It blooms late summer to early fall and can be left in the ground over the winter - hardy to zone 3.
The other cool link on Breck's site is their plant finder. There are buttons and pull down menus where you enter your preferences: Category (bulb, perennial, begonia, etc.), sun or shade, flower color, zone, usage (deer resistance, ground cover, back border, culinary, etc.). After you make your selection, the program gives suggestions.