There are two easy ways to obtain Ogrines:

Buying them:

With all means of payment offered for subscription, you can buy your Ogrines in batches of 700, 6,000, 13,000, 28,000 and 47,000. You will receive gift points for use in the Gift section as a bonus.

For free, through Market Places:

You can exchange your Collectible Cards and Kamas with other players. You will receive Ogrines from them in return that you will be able to use for more subscription, or DOFUS services.