F5 load balancer with AWS

Hi Sandeep, you'll find product availability on the market place : http://aws.amazon.com/featured-partners/f5/

you can either use Bring Your Own license (so you purchase a real license) or pay per use.

architecture and aws specificities like autoscalling are described here : https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/bigip-ve-setup-amazon-ec2-12-0-0.html