There are a gazillion free sample sign-ups online. Here are some that I think are worth mentioning.
Dunkin' Donuts Dark Coffee: Free Sample, if you've done this one before you can do it again. Don't drink coffee? Add it as a filler in a coffee lovers gift basket.
Haydee Chocolate Truffles: Free Sample of 8 (won't last long)
Mr. Clean Magic Eraser: Free Mini Eraser (this is an awesome product)