Where is the best place to find food samples by mail?

There are many sources that claim to offer free food samples, including Freefly's, Sample Buddy, Scam-Free Samples, Hunt 4 Freebies and All You. The websites differ in the ways in which they claim to offer food samples.

Freefly's and Hunt 4 Freebies are both littered with ads and pop-up videos, but both do have concise categorization columns. Freefly's lists every single food item on its page. Sample Buddy and Scam-Free Samples both are sharply presented and break the food items down into sub-categories with their own pages. All You is actually a webzine with an article that points to places where to get the samples online.