On The Road X5. It's not a 100% M1X design, but close enough. And it has pretty good PWM freq, slightly over 500Hz, and good performance.
http://www.cnqualitygoods.com/goods.php?id=1186
There is a Palight version of this for what....$38, but it's quite rough cut with nicks and all those. This OTR X5 is literally perfect as far as budgelights are concerned.