I only shop here! Seriously...Billerica & Littleton Collective Cannibis are the best places to shop. They have everything you want or need. All of the staff are knowledgeable about the different strains. These people are the friendliest people I have met in MACsince moving here in 2001! Here's a place you walk into where you feel happy and like you're there to see your best friend. Love the store, people and the managers! Everyone treats everyone with kindness. Shop here and only here!