You can find free iMacros. Although, it could be a long search that might not really bear much fruit in the end. You'll run across iMacros that don't work anymore, or that are half working, problematic, etc. Or you can buy a bot, like a previous poster suggested. Although that sounds expensive to me. Or you can buy iMacros. I can't post links, PM me if you're interested there's a guy selling them on this site for $6 and you get iMacros for almost all categories. Also included in the price is a 6 month guarantee for everything.
Cheers