"Just" an amplifier..
![Wink ;)](https://www.eevblog.com/forum/Smileys/default/wink.gif)
They´re a little bit more than just that, 1Mhz bandwith and full power are two things you can´t compare to the normal audio amps.
But, as always, it can get a little bit cheaper:
Aim-TTi WA301We got three of them at work, for CMOS circuits or driver circuits.
Pros:
-Cheap
-30Vpp Outputlevel
-50 and 600Ohms outputs
Con:
-No on/off switch