I use all UPB switches, some with dimmers, some with timers. I get all of mine through
www.automatedoutlet.com
Their web page use to have all the different types listed, but I think it's better if you give them a call if you decide to order. I've never had a UPB switch go bad on me yet, and I've replaced over 40 of them throughout my house.
DALLAS - 214.431.4407
HOUSTON - 713.535.9199
TULSA - 918.221.0371
AUSTIN - 512.961.4186
CORPORATE - 214.245.4594
Jeff