It's a deal you won't want to sleep on. A $30 dress that resembles a long, flowy nightgown has caught the attention of women across the country. The R.Vivimos dress is available on Amazon and became a viral hit after blogger Grace Atwood wrote about it on her website. "Best $30 purchase ever!" she wrote. "Initially I was wearing it mostly around the house," Atwood told Inside Edition. "I wore it in Mexico as a beach cover-up, and then I realized it was pretty cute with heels and a cute purse."