I picked up some at lowes that are made by AOSafety. They are basically their standard rubber ear plug with a hole down the center and an earphone attached. They are awesome. Block all the wind noise, but still let in just enough ambient noise to know when cars are around you and hear your motor, as well as hear your music clearly without having to crank the volume.
Pretty sure they are labeled as "blockade" or something like that. I liked em so much that when they went on sale a while back I bought 2 extra sets just in case I wear out the originals. Surprisingly though the original set have lasted me almost 2 years now, which is very unusual for me.