AWS Load Balancer with a static IP address

Question

I have a set-up running on Amazon cloud with a couple of EC2 Instances running through a load balancer.

It is important that the site has a unique(static) IP or set

Answer 1

You CAN attach an elastic IP to the instances BUT NOT to the ELB (which is what the client sees).

You could use a full reverse proxy layer 7 load balancer like HAProxy:

Or a commercial implementation like Loadbalancer.org or Riverbed (Zeus)

They both are in the AWS Marketplace: