Dan Gill has one at
www.Details4Scale.com
Also, Todd at Dreamworks sells the TAM Failsafe and he has developed his own...don't know if it is in production yet but he posted the unit for feedback and pre-ordering about a week ago.
www.dreamworksrc.com
If you like Tam's, you might want to call him directly to see if he has them in stock. From time to time, the on line store does not work too well.
Good luck,
Rex