What should i get my boyfriend my xmas or Christmas?

k well my boyfriend is my best friend his name is robby when been together for like 3 weeks all ready (i know short time but he is best friend)he likes basketball i want to get him something sweet and just for him i really love him a lot. but bad news my mom and don't know were dating they just think were best budd's so don't want them to know becuz i will get trouble and i wont get to see him anymore (were both 16) so i dont know what to get and my price range well got to be cheap but you know in the medium range so plz help me i dont know what to get him (we dont get to go out or hang out at places cuz school and his family is busy)