Yeah that's what's stopping me from playing SS as well. I have an older Wii-mote without the Wii Motion+ so I need to buy that in addition to the first party game that will never see a price drop.

You should look for older games where the dongle was included gratis, like Red Steel 2 or Tiger Woods 10. Worked for me!

Also, the ping pong game (and 100 pin bowling) in Wii Sports Resort is probably worth the money for the whole disc, which is another way to get the dongle.