Here, you lovely Drengin!
Have, for 250bc, this fine PQ4 Colony. With Festron Infestment, which, since it's Christmas and all, I'll throw in for free!
The whole idea of planet trading always felt weird for me. I mean, would you like Earth to trade three US states to Mars? So it's something I never did.
With the "Festron eating your people" issue, however, it might be useful...