$20 shipped? Show me where and I will buy about a dozen. Remote is $40, this Wii Play is $48, so for $8 you get 9 mini games, it's definitely worth it.
Local store in Rockville, MD had 6 in box sitting in middle of isle yesterday, they didn't have a display. There was 12% off coupon too that unfortunately expired yesterday, so you could have had it for $880 if you had gone yesterday.