Hello :)Unfortunately, the happy packs are limited to one pack per person. I have already made reservations for some people in-store. I can try to get one online for you or in-store if you’d like it, but it would only be the JSK Set 2 (high-waisted). I also have two slots available for the BTSSB happy set in blue at this time (pink is full). 

As for which is cheaper. I’m afraid I’m not very familiar with Tenso’s methods, so I’m unsure what their overall fee would be. I can tell you that online reservation through me would have a commission fee of 2000 yen regardless of weight. The shipping fee is simply whatever the postage cost is that gets charged by the post office. An in-store commission fee would be 4000 yen + 500 yen travel. :)