I created a soundfont using a simple distorted saw kick patch I made on my Korg MS2000. Feel free to use it in your productions. It covers a few octaves of pitches, each rendered individually.
MS2000 Saw Kick Soundfont
Also, this comes with some free advice. All the samples are mono because most of the time you really don't need to do any panning or stereo effects when it comes to your kick. It's usually best dead center in the mix.
Also, 10 points to whoever can guess what song this tiny fragment is from. This is an easy one.