Best way to get Traffic on new-to-me Zumo 550?

[rakad]

What's the best way to get traffic information on my new-to-me Zumo 550 when used IN MY CAR with the speaker/cradle? It came with a GXM30 antenna, but no subscriptions.

I think I could get a GTM21 FM antenna, and lifetime traffic subscription. That would run about $100. That's pretty steep!

Is there a better way? Note that I would only need the traffic feature when using the Zumo 550 in my car.

Thanks.

[97wing]

I'm using a GTM-11 on my Wing with the 550. I am using the GTM-20 in my truck with the 550. I think the GTM-10 would also work.