I have been looking around for a .gr domain, which is available but I cannot seem to find a registrar that offers a one year registration. All I am seeing is 2 years registrations.
Is this like that for a reason or am I just going to the wrong sites to register it?
Also, anyone know a good place to register Portuguese (.pt) or Brazilian (.br) for a good price?

Not sure about the .pt/.br domains but the 2 year registration length appears to be a Greek registry rule - that would be why you can't find one for the 1 year!
How long does a registration last?
The right acquired by the Assignment of a ‘.gr’ Domain Name shall remain valid for two (2) years form the date when the relevant Assignment Application is submitted to the Registry.
https://grweb.ics.forth.gr/english/faq.html#f19

Well there we go.
Thanks for the answer Ben.