Not sure what to get my step son for Christmas

Me and my step son don't really have a relationship. He lives with us because his mom couldn't handle his behavior. He was definitely extremely troubled and disrespectful but I can admit I probably added to that. We had a really big fight Thanksgiving because I accused him of something he didn't do. You guys were right and I did work up the courage to apologize. He was kind of awkward about the whole thing. Ever since then things haven't really been bad. We say a few words to each other but he mainly leaves to be with friends or go do something with his dad. My husband is trying to fix their relationship because the night the fight happened his son left the house and he went to find him and they had a talk and my husband found out his son has a lot of hurt and resentment towards him. So he is trying to work on their relationship. I really have no idea at all what my step sons interests are. He doesn't talk much to us and spends most of his time with friends now. I have no idea what to get him for Christmas. Whats something I can get a teenager that all teens pretty much like?