from thorsten at g-ladersiete.de we have the following offer

10 Pieces: 799,- EUR

15 Pieces: 759,- EUR

20 Pieces: 719,- EUR

roughly 15-18 euro each to ship

this includesvat

so for 20 = £638 ish (1.15 euro to pounds- all depends on exchange rate we get tbh)

if 1.19 like some places = £616