As per post #2, either
1. pay for RHEL
2. use eg Centos or SL instead.
The latter 2 automatically setup to point to their repos for you at install time.
These are basically rebuilds of RHEL and Centos in particular should be almost identical apart from some proprietary RHEL images/copyright stuff they cannot (legally) reproduce).
In practical terms, its pretty much binary compatible.; have a good read of their website and the Wikipedia article.