Here are some of my favorite bridesmaid dress collections...
Eden has super cute bridesmaids and a wide variety of colors. Most don't have sleeves, but would look very nice with a bolero or cardigan.
More cute bridesmaids, lots of colors. They also have a modest line (called "Temple Maids").
These dresses are less formal - more like Sunday dresses - but because of that, they are also inexpensive. The color selection is limited, but they can be ordered (or purchased in some areas) very quickly.
Love, love, love this collection!