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I use interlocking foam gym tiles, grey ones, similar to:
http://www.ebay.co.uk/itm/like/261554352218?adgroupid=13585920426&hlpht=true&hlpv=2&rlsatarget=kwd-75951457746&adtype=pla&ff3=1&lpid=122&poi=&ul_noapp=true&limghlpsr=true&ff19=0&device=c&chn=ps&campaignid=207297426&crdt=0&ff12=67&ff11=ICEP3.0.0-L&ff14=122&viphx=1&ops=true&ff13=80I needed to cover quite a large area under the Computrainer. They're maybe 10mm thick and pretty good.
any recommendations which floor mat to get? would be good if it would absorb some of the vibrations and not costing too much.