They were very expensive last I checked. If you already have an ipod, a cd player, or any other mp3 player then you can build you own for a lot less (won't be remote, tho, but will be with wires from you all the way to the speaker).
Send me a PM and I will hook you up with instructions, or if you prefer then I've been thinking about assembling and selling them, actually; let me know what works better for you.