I remember when Plan A Party was just a little shop in the Clarion Mall. They have moved and expanded a little bit since then. This store isn't as big as the party stores that you find in the cities, but they do have a nice selection of supplies. You can order wedding invitations, find decorations for just about any type of party that you are planning and the prices a pretty reasonable.
Plan A Party also offer a decoration rental service for some bigger items that you may need for wedding receptions and such. They rent arches, punch fountains, large signs, and other items.
I bought a few of my decorations for my reception from this establishment and the service was great and very helpful.