Those "surprise bags" look really cool! One possible way to get all twelve figures would be to inquire at a retailer whether it is possible to purchase an entire box. This assumes that a wholesale order will include equal numbers of each figure - I am assuming that Playmobil will include one of each figure in a box of twelve or multiples thereof, for example 4 of each figure in a box of 48. A small local toy store might be more receptive to this sort of arrangement than, say, ToysRUs. Also, did everybody notice that the package says "Series 1" in the top right corner? So they must be planning to do more of these over time, maybe a new series each year?
Here's information to the twelve figures. I translated with google. 
. . .
Special Gag: The figures in the collection bags are not mounted, but are included as parts for assembly and mixing. This is particularly pleased PLAYMOBIL adult collectors, the need for their decorative themes landscapes often specific figures. Through technical changes in the shape and the production process, it is now very easy to put together the character of the individual parts. Special fun it is to mix the various accessories and parts of the collection figures together and combine. So always create new characters to collect and play. . .
Don't you think that this just means that the accessories are not already assembled on the figure? More "special fun" for the "adult collector" and lower labor costs for Playmobil!
Adding a later thought: I guess it would actually be necessary to order 2 boxes of 12 (one box of 5203 and one box of 5204) unless they combine all 24 into one box.
