In need of Power cord For GQ RX-733

Hi everyone I am in search for a power cord for my Great Quality laptop the model is RX-733 or GREEN 733 if anyone has one or knows of one please let me know, the tip of mine was stepped on when I let my niece use it in the hospital back in 2010 and I have purchased 4 on ebay so far but wind up sending them back because they don't work the tips don't match mine even though everything else about the cord matches so I guess the tip that plugs into the laptop matters a lot? I have attached photos of my cord, thank you in advance.

 

I have a Targus universal power supply. I bought it for my old Gateway years ago but now I use it for the desktop dock for my Thinkpad and keep the original power brick in the laptop bag. It comes with several different tips and a USB charger now.
http://targus.com/US/laptop-charger-apa30us
They sell them at Walmart and the other box stores, which makes returns easier.