The link indicated in the Easy Cable Build PDF file is out of date, but they still sell the connector. I ordered from this link
which I believe is the same Hong Kong seller as in the expired link. I've ordered components and parts from HK before in the past and never had any issues, but I'll let everyone know how this one goes.
Suffice it to say I'm not ordering from the Lithuanian site, but I'm fairly confident that I can assemble a cable. I can get a resistor locally and I have a 500' box of CAT5e network cable just waiting to be crimped.