Have you tried eBay yet? Right now, there are 4 auctions running on eBay.de with reasonable starting prices, three of them including shipping costs to Finland. Hard to tell, how far they will rise, but since there are more then a couple running at one time, chances are, that you can snipe there a good bargain, if you watch the offers for a few weeks.
P.S.: I now checked the recently ended auctions. Seems,
this had been the cheapest bid so far, many auctions don't end below 12€ inc. shipping. So right now, it might be, that you would need a little patience, before reasonable prices are available. It all depends, how many customers are willing to pay more (or are getting berserk during the final stage of an auction), but there will come the time, when they all got, what they wanted, and then the prices will fall. Last November it was not unusual, that people paid 20€ just for the three tiles, you can't find that in January anymore.