Well, there are two deals going on:
1) 15% off all Israeli wines at onlinekosherwine.com
2) IWPA is having a rebate on all the Israeli wines they sell:
http://origin.library.constantcontact.c ... 5-12+C.pdf
Put those together, and that is quite nice. Remember, that kosherwine.com will match most deals on the web, so they too are an option for you if you like them more, and if the wines in question are available there.
Think of it this way, you pay a lot for these wines why not get them for less and have Royal foot the bill