We mused about the subject a few months back, and now PEGA's delivering with a set of cheap plastic Wiimote attachments. For ¥2,780 (about $23), suckers can preorder the set, which includes a mock golf club, baseball bat, and tennis racket (all measuring approximately 16 inches in length). At that length (and without much weight), the attachments won't add much to the sense of realism; though they will increase the risk of actually striking someone or something while playing Wii Sports. No thanks.
See also: Wii-eel attachment looks rather un-wii-ldy