I honestly don't understand what you are getting. WHOLE keyboard? Are these hot swap PCB with hot swap LEDs? What kind of otemu switches? One of them looks like novatouch or royal kludge Topre imitations to me. And isn't that a double sided PCB which is supposed to be better than a single sided PCB?
Lots of info on that page but I'm waiting for that TP4 guy to explain.
The cheapest ones are no LEDs and your choice of switches.
As they get more expensive, the LEDs get more complex and more fancy addons are available.
You can use a proxy like taobaoring or mistertao to buy taobao stuff to the USA.
Seems pretty hard to find one that does epacket shipping though, which is the best because it's both super cheap and the same exact service as EMS Express.