Dress shopping

My husband's friend is getting married in March. This means I have about a month to find something to wear. I found some very cute plus size dresses online but, of course, they are pretty expensive. I'm not sure I can get my husband to drop $200 or more on a dress I'm probably only going to wear once. This one is really cute but, not only is it expensive, it will also take way too long to get to me. Man, I hate dress shopping.