Well, I was going to point you towards rightsuf.com since they usually have cheaper prices than other stores, but it seems that we are both in luck and they are having a 33% off sale on all Yen Press manga until November 12. "This includes new series, such as Thermae Romae and Umineko: When They Cry, plus the latest volumes of Is This A Zombie?, Spice and Wolf, Haruhi, Puella Magi Madoka Magica, Omamori Himari, Bunny Drop, Durarara!!, Higurashi, Pandora Hearts, Soul Eater, and many, many more!"
Now that I've seen it, I'm definitely going to take this opportunity to buy up a bunch of Higurashi manga. Just keep in mind that the sale only lasts a few more days.