Books On the Knob reports three free e-books at Borders (Adobe EPUB, of course). Judging from reviews and such, one's a hard-boiled-style thriller while the other two are romances. One of the romances seems to be a twist on the category romance, with the three stories intermingled instead of one after the other.
I don't know how Karen found those. Borders doesn't have them on its (remarkably lame) free e-book list. Use the links that Karen's provided at Books on the Knob to find them.