Flex Flooring might be a very inexpensive solution to vibration problems. I used it to solve a vibration problem with an antique oscillating fan.

Flex Gym flooring is available at most sporting goods stores or online. 2-ft x 2-ft squares x 1/2" thick pieces interlock and/or can be cut to fit any shape very easily.

Very, very cheap. Looks good, feels good to the feet as well--I redid my bathroom floors with it.