For those of us into the dramatic, this section of Salt Lake Sites lists web sites offering costumes and theatrical supplies. The stores carries costumes for all seasons, including Halloween. Our sister site (A Fountain of Bargains) lists major online Halloween stores from around the US.
Costume Craze (merchant profile) - review Costume Craze has a huge selection of costumes for all ages. The selection includes movie themed costumes, historical costumes, animal themes and costume combos for couples.