You need a source of coherent electrons, which is generally quite expensive and—assuming this is something you want to attempt yourself—out of reach for all but very rich amateurs.
Lucky you that I read this thread. The DSE is quite easy and cheap to do at home; I've tried it myself - check out my PF blog post about it here: https://www.physicsforums.com/blog.php?b=4096 . EDIT: sorry, did not notice that it was the electron version that was asked for . That's definitely not as easy to do as with photons, but I have some link about it, I'll post it when I've found it...