Retail price: 770 yen New, still in shrink wrap. Instant purchase is OK. I sometimes travel for work, so the period when I can't ship is listed in my profile. Bundling up to 4 books is OK. I will discount 200 yen for each book after the second one, which is equivalent to the shipping cost. If you can't specify the price when requesting a bundle, I will set the price after the discount when I create the bundled listing. (*´˘`*)