AWS EC2 Alternative with high instance limit

I'm designing a system to help with load balancing during DOS attacks. I'm looking for a service similar to Amazon EC2 without instance limits or extremely high instance limits. Currently Amazon allows me 40 instances, I need in the realm of a thousand. Does anyone know of a provider that will allow this? I don't feel like signing up for 30 different providers only to strike out. Thanks.
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Shalom CarmelCTOCommented:
Amazon will allow you thousands - but you have to coordinate it with them. They put a cap on self deployment after some people made costly mistakes :)

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