I don't see why you couldn't. But don't forget you'll be missing out on the cool card that comes with the ICO 

You can buy centra on EtherDelta exchange now:

https://coinmarketcap.com/assets/centra/

its trading at a discount to the ico price!! yum yum i like cheap coins

I'm a bit skeptical and I'm not sure which one to go with. I know that Monaco will launch at the end of the month but what about TenX, can people order the cards yet? I'm not in a hurry to earn money but since the ICOs happened almost in the same time and both projects are targeting the same type of users, I'd like to know the current roadmap for this project and act based on it.