In my daily search of free samples, I stumbled on a two a awesome packages of kick drum samples (by AAASamples) that are on the harder side.
In total there’s 83 kick drums in two different packages. Download the samples by visiting the link below.
EDIT: the AAASamples.net website seems to be suspended for some reason (?), but you can download the samples straight from here:
Sorry, I removed the package from my server because I’m not sure whether I’m allowed to share the samples or not.. sorry for the inconvenience!