You could always abuse Microsoft Azure VPS.
Per Hotmail account, you get a 30 day free trial which gives you access to all their VPS packages with (as far as I've seen) no limitations except used core count.
Also, you'd be botting on practically an unlimited amount of unique IPs / HWIDs.
List of packages:
I think the trial is capped at 20 total used cores - but that's it. (I may be wrong about this, and instead per VPS is limited to 20 cores, which of course you could create multiple VPSs)
If needed, you could setup the 16core 224GB RAM VPS - then from there assign 1 or 2 the cores per Honorbuddy / WoW client.
A few 'hardcore' botters out there use this and have been for a while. Now I'm probably going to get several angry PM's for exposing their methods. ;P
Anywho here's a screenshot of the 16core 224GB server.
Bam, a disposable super-botting computer at the price of nothing but a hotmail account.