I'm sure that you, or someone, could make anything you want, given enough funds. It's just difficult to control the waveform when things get that fast. Plus, why would you need all that flexibility above 10 MHz? Certainly won't be useful for tuning radios and TVs. High end audio equipment might be testable with non-sinusoidal waveforms, but how high do they go in frequency?
Me thinks you should spend a little time figuring out the use for such a piece of equipment, before you go on a hunt to find or make one.
that