Although I dislike steam and desura and would probably only be willing to part with $5 or so myself for this game if I could get it directly.
I`m also allergic to Steam - and used to think Desura`s the same, but it`s not the case. It`s not much advertised but you can actually buy games from them DRM Free, as direct downloads, no need for client installs.
It`s also worth watching out for various bundles - that`s how I got the Dark Gates, it was in the Hellish Dungeons bundle on
indiegamebundle.org (sadly retired now). Good site to keep track of such deals is
http://www.indiegamebundles.com/ or maybe we could have an alert thread somewhere here...