If you trace back the history of all of these Canadian sites using publicly available information (BBB, Manta, Etc) you'll find that all are owned by the same owner under one of three companies: Netlink Computer Inc, GTO Media Inc, and B&D Technology Inc. NCIX US is a seperate entity also owned by the same owner.
NCIX.com - Active
NCIXUS.com - Soon to be defunct or merged back to Canada operation.
NCIX.CN - ?
NCIX.TW - ?
Best Direct - Defunct.
Direct Canada - Active. Now operating as a division of Netlink Computer Inc (NCIX). Previously was setup under a different company, unclear if they have merged this back Netlink.
Memory House - Active. Website defunct, used as their marketplace account on various sites.
NX Source - Active. B2B sales.
Compu2000 - Active. Now operating as iGalleria (not sure the name change is an improvement as an aside).
TDDirect - Defunct. Changed to Best Direct.
GTO Media Inc - Active. Owns Hardware Canucks.
Hardware Canucks- Active.
SingleBasket - Development. Formerly Shopstar,
There is a bunch of other random side projects but these are the most relevant.
Any issues effecting Netlink Computer Inc will have an impact on these. All ecommerce websites that sell product leverage NCIX inventory and credit lines.