Barsoom imitators

[Hand of Evil]

You may be able to find them at www.blackmask.com

They have Kline's Man from the Moon: http://www.blackmask.com/cgi-bin/newlinks/page.cgi?g=Detailed/12528.html&d=1

 

[Swoop109]

Here's a link to a free webcomic done in the "Sword and Planet" style;
http://atomicpulp.supernaturalcrime.com/strips_pages/strips_pages_POPX/popx_menu.html

 

[jester47]

Buck Rogers and Flash Gordon come to mind. Not rip offs per se, but definitely derivative.

Aaron.