I could think of DigiKey, couldn't remember Mouser....good call in North America.
To original poster....round plug in or "strip connect"?
Amphenol does a ton of connections, way up to "Mil spec"....but expensive.
Lower cost is Amphenol, Phoenix, etc......
Knowing your "style type" helps.
Frankly, real cheap plug in (Sermos/Anderson) can handle major power, good crimps (maybe dielectric grease, soft silver solder, "tweak", etc.) can handle data type connections.
More info from you, better answers from us....have a great day...