Okay, Princess Auto here in Edmonton has Luggage Locators. Small-ish, green, and they have a 60 foot range (line of sight is much more, like 100 feet). I bought a set, for use with my more expensive rockets. They appear to be fairly well built, with a steel threaded locking ring that would attach to your nose cone or inside your AV bay.
$10.00 after the GST. Give your local Princess Auto a call and see if they have any left in the Surplus Section. Cheap insurance for your $$$ rockets.