Guild Wars 2

They advertised adding Margery, scarlet, kasmeer and faren, but I only see the pet rock on the store. Where are the other time limited mini?

They’re not in the gem store. They were added to the tickets that drop from black lion chests.

http://wiki.guildwars2.com/wiki/Black_Lion_Miniature_Claim_Ticket

What I find slightly odd, is thet the rare minis are 1 ticket and the common minis need 5..

It’s based on their actual rarity rather than what it says when you mouse over them. The Scarlet, Mai Trin and Marjory minis were available from black lion chests for a long time, but the Southsun minis were only available for a shorter time and therefore in much lower supply. If you look on the trading post, the cost in gold for each is in roughly the same ratio as the cost in tickets.