Purchased a 2005 530 and I am looking to purchase a Dension 500 to connect my Iphone.Where will I get the best deal.

 

I've been after a Dension 500 myself. The cheapest I have found thus far is 2nd hand off eBay. I haven't purchased one yet as I can't confirm if it would work with Spotify (in terms of changing songs via steering wheel).