Julie this is what I've used in the past, I also know that Kiernan and others have used them also. Just expect them to maybe last a season.
You just have to find the right hookup for your radiohttp://www.ebay.com/sch/i.html?_from=R4 ... m&_sacat=0
When it does work it's pretty good, one speaker for each ear allows you to hear very clearly and the mic attaches to inside your face guard for clear transmission.
These are the cheapest that you will find, but again they will probably last about a year, it's the connectors that go bad.