Funny, I was looking for the same thing (12-24, ready for a pre-ordered K10D

.
I speak good German but it's still not really clear - I think the shipping is 31 Euros (the UK most be 'other EU countries') (this is on
http://tekade.de )
But the really annoying thing is that they don't take credit cards, so you have to do 'Vorkasse' which as I understand it is basically a bank transfer in advance. This is quite common (and cheap) in Germany I believe, but for us in the UK it's hassle (a trip to the bank) and expensive - ISTR last time I did one it was GBP 13 just in bank fees! At Tekade 12-24 is E609 + 31 shipping
Looked at
http://www.cyberphoto.se but couldn't see a way of getting it in English and didn't fancy guesswork.
http://www.topfoto.de/ have a lovely clear info page for GB customers (click on the flag) but also only do 'Vorkasse'. 12-24 is E649, Shipping 27.24 Euros
Looking for more online shops I found this page on the German Pentax site listing 'trusted online dealers':
http://www.pentax.de/_de/photo/haendler/trust.php?photo&haendler&trust
From there:
First one
http://www.digitaleyes.de/ takes credit cards and shipping is I think just E11.90, but they don't seem to list the 12-24 (they have most other lenses).
http://www.dnet24.de/ have the 12-24 for just E597.29. Shipping 25 Euros but couldn't tell whether or not they do credit cards.
http://www.technikdirekt.de have a nice English version of their site and do apparently take credit cards. Not totally sure of postage but I think 22 Euros. So 12-24 is E629, shipping 22 Euros.
http://www.ep-netshop.de - lost patience with the navigation, but don't think they do lenses just cameras/kits.
http://www.hamer24.de/ - lost patience again but couldn't find the 12-24 or other Pentax lenses. No sign of credit cards.
http://www.rutten.de/ - E699 for the 12-24, didn't bother further.
http://www.fotokoch.de take credit cards. 12-24 is E629, 20 Euros shipping.
http://www.mediaonline.de/ - couldn't find the 12-24.
http://www.topvision-online.de/ - couldn't find the 12-24.
Think Technikdirect is the front runner just now for having a clear website and taking credit cards.
With 650 Euros = GBP 438ish, probably well worth the hassle shopping abroad anyway vs e.g. £569.00 at SRS.
Cheers
Pete