samples?

Madi • Mama of 2 🌿 Artist. Nature. Salt Lake. Moonwoman 🌙
Do any of you mamas know where/how to get free samples of baby items? I keep seeing posts about mamas getting free samples for baby mailed to them on a Facebook group, and I have no clue where or how! (Which might sound stupid lol) Anyway, have any of you done this? If so, how? 
Thank you! 💕