Appreciate the issue of RIO going under & the availability of the Karma has been discussed on a couple of existing threads, but these seem to have gone quiet recently. Has anyone found the Karma still available anywhere? Dukebox.com (via Amazon) has dried up. If not, what suggestions for a substitute. Size isn't an issue(!) - this is going to be used in the car, so the important things are sound quality & battery life. Thanks.