Starting tomorrow (5/18), you'll be able to pick up a FREE limited edition panty (with purchase) at Victoria's Secret to celebrate their reaching 3 million fans on facebook. They announced this a while back, and even held a vote so fans could vote on their favorite choice. If you're interested, be sure to print your coupon and head in before your store runs out.
Of course, like any VS freebie that requires purchase, you'll be able to pick up something cheap. I tend to look for the $1.50 lollipops in store, but they also have hand sanitizer and occasional travel sized beauty items for around $3 or $4 near checkout.