Need help with SpaceVision Games and others

The games below came into the Salvo's where I volunteer.  The Spacevision games have three buttons , 2 on the top and one on the front.  They each have 8 games on them as you can see in the pics.

Plus the other 2 are BMX Airmaster and Double dragon.  I'm in Australia so I presume they are PAL games.

I'm trying to get a feel as to how much they are worth so that I can price them. So any idea on this front would be appreciated


http://www.flickr.co.../in/photostream

http://www.flickr.co.../in/photostream

http://www.flickr.co.../in/photostream

http://www.flickr.co.../in/photostream

http://www.flickr.co.../in/photostream