Alternatives to rubber resins

Posted in Custom Workstation

Hi All, New to the Realm and customs in general. I was wondering if there are any (cheaper) alternatives to rubber resin/silicon putty molds. I am working on a custom tmnt figure and just need to cast the head to get working on completing the figure. Just wanted to see if there are any alternatives before dropping the green backs on the rubber resin and silicon putty.

Was thinking that a hardware store silicone caulking type substance would work but not sure if it would capture all the detail.

or if you could point me towards a post that is similar to this one that would be great too.

Thanks for the advice!