Are there any PSU's available that still use these types of connectors? I can't seem to find any

Because after a while, they found that the fewer number of pins, despite being heavier gauge, could handle lower current without getting too hot, so they were quickly discontinued.

back in the day quite a few had them connections.

hiper is one
One = quite a few?

The ONLY people that used it was Superflower and the Hiper PSU's made by Superflower and the Rosewill Lightning also made by Superflower (shown).

Everyone else realized it was a fire hazard.