Someone in the Books forum recommended Jingdong.com (jd.com) as a place to get Chinese books online, that will also ship to the US. They advertise FREE worldwide shipping on orders greater than $49, and price all of their items in US$, as well as yuan.
I have no experience with this web site but, if you enter the Chinese name of the first set you mention in their search box on their English site (en.jd.com), you get this page (which shows 4 of the 6 volumes, right now):
http://en.jd.com/search?key=%E6%9D%8E%E6%98%8C%E9%95%90%E7%B2%BE%E8%AE%B2%E5%9B%B4%E6%A3%8B%E6%89%8B%E7%AD%8BTranslate to English after you go there. Each volume is $4.34, with free shipping if you manage to get over $49. If you don't want that much, maybe you can find others who will combine their orders with you, and arrange to forward along the various sub-orders after they arrive.
Even though the front page of en.jd.com is in English, most of the interior pages are still Chinese. I have found that the site is navigable in Chrome if you use Google Translate.
Given that the price is right, I guess we need someone (or a group) bold enough to give this a shot. Or, maybe someone else has a better outlet? I remember someone mentioning a web site in Taiwan as a good choice, but can't find that post right now.
[UPDATE] Another tip... Go books are found on the site under this category (once you have translated the categories to English using Google Translate):
JD > Chinese Books > Sports > Chess