Mac full size keyboards with built in trackpad

I want to attach a full size keyboard to my macbook for at least a couple of reasons:

a) the macbook keyboard is slightly undersized. It is enough so to give my fingers headaches (or something like that..)

b) I want to look straightforward at the screen but not use an external monitor. Thus I would position the keyboard 12 inches below a small pedestal for the mac

Having looked at numerous sites I can not find a full size keyboard with trackpad. There are very few options for keyboard with trackpad for Mac to choose from. Do any exist?