Isolation platform for the power amps

Try placing Herbiesaudiolab.com "Tenderfoot," or "Iso-Cup" footers between amp, and one of the bases mentioned by Bdgregory, above.
Herbie's has a ninety day (!) home trial policy, so you can't go wrong.
The current version of Herbie's footers isolates/absorbs all those bad vibrations received from the environment, and from the component, itself.

Here is the cheapest amp stand you can buy. They look okay, as they are just plain old black amp stands. (They have very little isolation, except for their floor spikes and small rubber cushion buttons, that the shelf sits upon.)

I bought mine used from a friend for $75 for the pair.
He went on to buy some really nice looking Zoethecus cherry wood trimmed stands (used) for about $700 a pair, and then upgraded again to some great stands (Grand Prix Audio, I think) for about $3,500 a pair. His system sounds great, and he thinks the stands have helped a great deal, especially the Grand Prix Audio stands. (To be honest, I really have not heard the difference myself, but then again, I don't live with his system everyday, so I can't say for sure if they work or not.)

I use these same stands for my amps, and while I probably could (and maybe should) buy something better, it is just difficult for me to spend hundreds, if not thousands, of dollars on stands that sit 3 inches off the floor, and which amps, (with no moving parts), sit upon. (I'd rather put the money into better equipment or music myself.) My wife thinks they look just fine too.

Target Pro amp stands

i have my amps sitting on brass cones then 2" maple, isoblocks between that and another platform then cones to the floor. complete isolation and it sounds that way too.

If you make your own isolation platforms I would suggest putting them on brass audio points of some type.

DIY is the lowest cost option by far, and depending on how handy you are, and how much effort you want to put into it you can come up with a very attractive and effective stand with minimal cost. I made some using butcher blocks from TJ Max ($20 each for the block). Depending on what kind of footer you put on it they'll cost less than $30 each, and probably no more assembly time than $100+ stands. You can use other material for the platform too, such as a simple MDF, granite, etc. I made another pair using flagstone from Home Depot (2" x 18" x 18"). Talk about cheap, but they are heavy, very effective, and IMHO pretty attractive.

For that price, I would recommend as thick a piece of granite as you can afford used in a 1" deep sand filled box. Forget air suspensions.

I recommend Symposium shelves.