ThrottleMiester ( approx $150-$175)is a nice set up, throttle lock only.
Audiovox (Approx $100)cruise is full system, after market for cars and can be used on a busa.
I have both.
The Meister is very easy to install the audiovox is not. If you are not mechanically up for the job, do the meister.
Dealer here says they don't like to do them. About $600 in labor if they would do it.
There are some people using a $20 lock, basically a plastic clamp.
Depends on your required level of comfort and the size of your mod account.