Where can you get your cue weighted?

Most cues are made to be adjustable. The weight bolts are changed, added, or removed as needed from the butt end of the cue. Remove the rubber bumper from the butt end of the cue. If there is a weight well, then your cue is adjustable. If there is no weight well, then I would recommend you have a cue maker or cue repairman determine if your cue can be made adjustable.