Let's talk about how expensive bridesmaids' dresses are (REALLY expensive!!). I don't know about you, but when I think of deals on clothes, I don't think of spending $100 on one dress, but most bridesmaid dresses advertised as low cost are $100 or more, and that doesn't include accessories.

Plus there is the wear again factor- most brides want to help their girls out and try to keep dresses and accessories on the low cost side AND give girls something they can wear again.
Unfortunately though, unless your girls are in the habit of attending balls or charity dinners, most dresses are not wear-again.
Thankfully (as it is with most things), there are deals and appropriate styles out there! All it takes is a little digging.
I've complied three looks with items taken from department stores and online shops. These looks are wedding appropriate and all under $100 for the dress, jewelry and shoes.
*disclaimer: there is a downside to online shopping. If you find a dress or shoes you love and they are on sale, make sure you get your girls moving ASAP before there are sell outs of their size or desired color.
Look One: Casual (appropriate for spring,outdoor or beach weddings)
 Dress: $26, H&M
Look Two: Daytime Elegant
 
Look three: Evening Elegant