Walmart is one of the leaders to get stuff cheap or free, if you're using coupons. They have been holding events for samples recently, and sometimes you can find them set up in the store, passing out samples.
Here's some items you can expect to sample at this event:
* Oscar Mayer Angus Hot Dogs
* Kool-Aid Fun Fizz
* Crystal Light Pure
* Dentyne Pure
* Oreo Fudge Cremes
* Ritz Munchables Pretzel Thins
* Jello Mousse
* 100 Calorie Cheese Bites
Find your local Baltimore Walmart Supercenter, although I only have seen a couple of them in Maryland. Times and dates will be listed for each store, so you can pick which store and which date to go.
You can save money right now by printing some coupons for some of the items above: