Txlef,
IF you want to spend some money, then a bunch of people have given you recomendations! Some of the stands they have recommended are great looking. I've heard none of them so I cannot tell you how they sound.
My suggestion is much more modest than theirs & borne out of my experience except for Marakanetz, who seems to be on the same plane as me.
Go to H-D or Lowe's & buy 4 tiles of Granite & place them on the floor/carpet & place the amps on these tiles. 2 tiles under each amp. This should help a lot. Granite is very hard & is great at isolating the component from floor vibrations. I did this for my ss amps at 1st. I have now moved them up onto Target TTF-1 amp stands. There has been no sound improvement to my ears NEITHER has there been any sound degradation, which is why I have retained the amp stands! What this told me was that IF the amp is well designed, it should not respond too much to any further isolation i.e. all the necessary isolation should have been taken care of at the design & manuf. point. IMHO & YMMV.
Others here might disagree or seriously disagree w/ me. That's fine 'cuz I mean no offence to any other member's suggestion. Each of us has an opinion based on our own experiences.