Tremolo Effect That is Not a Pedal

Does anyone make a tremolo effect that isn't a pedal? I know Area 51 made the BMT-60 which they no longer make but does anyone else make something like this? I'd llike to have a dedicated, very subtle, tremolo effect (Think Manuel Galban) in the chain. I wouldn't mind a pedal but I like the idea of the BMT-60 so much. I mean, if its always on, why have it on the floor?

I am looking for an add on that is not an amplifier alt (like the Weber Vibrato chip). I'm having no luck.

Victoria makes a combo reverb tank/tremolo called the Reverberato. Best soundig tremolo and reverb around. Pricy.