non-ogm chicken feed

Does anybody know where to buy non omg chicken feed in Portugal? I normally supplement my chicken diet (kitchen scraps plus a lot of different greens) with only corn and I used to by the only one I found which didn't say OGM. Now the same brand also declares that it "might" contain OGM corn...
I asked in the store but they don't seem to give a damn...
I would like to grow my own next season, but where can I buy seeds?
Thank you guys!!

Me again: what about buying buckwheat in Portugal?
Thanks again...

Hi,
Trying to find something without GM is a nightmare. But I found a supplier who sells organic chicken food. They are mail order. It isn't cheap but it is organic and my chickens like it as a supplement to whatever else they can find. http://www.tiendanimal.pt/racao-ecologico-para-galinhas-p-8760.html

Thank you Ben Seall! Well it is indeed NOT cheap....The average 30 kg mix I find is 10 euros....We better start producing our own and even sell it!!!

I supplement my chickens' diet with whole oats and sunflower seeds, which are not yet genetically modified. The rest of their diet is foraged. Eventually I hope to provide all their diet with forage, which is possible in a warm climate.

Do you feed the whole oat with hull and everything, Tyler Ludens? I am currently giving them whole wheat because I thought they wouldn't like the hull/husk bit...