They are giving away 100 Winter Woodland cartridges over the next 5 weeks, 20 cartridges each week. All you have to do is search for the topic on their message boards and then post underneath it search for 100th cartridge it should come right up. Then you can enter again by posting on your blog about the giveaway.
Here is a link to the product “Winter Woodland” so you can see it:
Here is a link to the actual forum post as well for this week to get you started:
Good Luck !