Play with the old tokens ?

Hi, I would like to play killteam but my local store only sells this upgrade set and not the core book either, so I wonder are these tokens still available ? Does the internet rules suffice to play or should I found the core book on another shop to have all the details ?

Hi, I would like to play killteam but my local store only sells this upgrade set and not the core book either, so I wonder are these tokens still available ? Does the internet rules suffice to play or should I found the core book on another shop to have all the details ?