domain Join3G.net and Join3G.mobi

[mac44]

I am a newcomer. Can someone give me an idea about how much the above domains are worth. I will also have the .com version on May 18.

In addition, I have Join4G - .com, .net, .mobi, .me, .info

Where is a good place to sell these names, and should I sell them separately or together?

Thanks for your help.