If you have a computer and CD's, you could always download some of his favorite songs and burn them to a CD for his car. All his favorite songs, or romantic theme.
Just a thought, and it actually cuts the costs down later, we don't exchange gifts for Anniversaries. We discuss things we want as a couple, and decide together what we want to buy. Perhaps something for the house (shed, or entertainment system), or something that we will both enjoy seperately but we share(like an Ipod), or could be something monumental. We planted 3 maple trees once for an anniversary. That's fun because we will always look at those trees and remember exactly why we have them.