Unionmade, Context, Blue in Green, and one other I'm not remembering carry Kapital, but American prices are often at Visvim levels of silly. Yahoo Auctions or Rakuten are your best bet for lightly used items, use Kapital's webshop or a similar carrier with a proxy for direct purchases. It's still much cheaper.
As for the sizing, 2 is the smallest size for men and isn't exactly consistent; bagginess changes depending on how the garment is intended to fit. Sizes 0 and 1 are often repurposed for female proportions, so sizing down from a 2 is not recommended unless you can try the garment on in person.
I'll get a new Kapital fit on here at some point, but for now What I Was Wearing at Kapital Kyoto:
Apparently Anthro (lol) is carrying Kapital for the ladies, at least online.