Well, the splat markers are home-made, so you cannot buy them. The good news is that they're really cheap, very easy to make and take only a few seconds each to paint. Here's how I do it:
Making the tokensI bought my counters from EM-4, though I'm sure that other suppliers of "game accessories" will have similar products. At the time of writing, a pack of 12mm clear counters costs £1.02; each pack holds 50 of the disks.
For the splats, I use a bright scarlet acrylic paint that has been on my bench for years. Indeed, it's become a bit too thick for most purposes, but works just fine for this. If you want a less cartoon-like appearance then perhaps a darker red might be more appropriate. Also note that I don't use my best paintbrushes for this project!
Paint goes on in 4 simple steps. Once you know what to do, it only takes 10 or 20 seconds to finish each token. So:
Leave to dry. You're done!
The finished markers can be used to indicate the position of bodies. This is especially useful in a game with a high casualty rate where you don't have enough models of dead people! They can also be used as wound markers if your game has units which can take multiple hits.