Just modded out a couple of posts. Please can I remind members that Amibay doesn't allow warez in any instance.
Kickstart ROMs are still covered under copyright. The only legal way to get some is to buy a set of genuine original ROMs. The best way to ensure that you get genuine ROMs is to buy from a well-known and respected Amiga dealership, such as Amigakit or Vesalia, or second-hand from a trustworthy source.
Be aware that there are a lot of dodgy sellers on eBay selling fraudulent Kickstart ROMs at lower prices. Caveat Emptor: you get what you pay for!