They've been around for a few years, but arent a well known feature.
You can get a 32 vCPU / 16 Core for .28 USD / hour most of the time.
You have to work around the fact they can turn it off and delete it at anytime though - I have my wallet on a normal "on-demand" type instance
That's a good clue which will be useful for many people. May I ask how many knumbers these 32 virtual cores do so I can compare the price? My i7 920 is around 0.081$/h (43/month, can be had for 41:
https://robot.your-server.de/order/market ).
2080915 knumbers/sec on the one I just checked.
Under the covers, its Xen virtualization running on 2x E5-2670 CPUs - with the 32 vCPU instance, you are basically getting the entire physical server with a little overhead for the virtualization part.