I think every herb garden should have a space for oregano and sage. Both are lovely perennials!
Seed Ideas:
The first two you can find online from Botanical Interests.
True Greek – has small white blooms
Common – has pink to lavender blooms
I found the next two choices from Rare Seeds.
Vulgare – this variety is similar to common oregano.
Wild Za’Atar – the flavor of this one is said to have hints of oregano, thyme and marjoram.