I managed to find myself the last surviving 75x75. It's in Forest Guard.
Here's the list I compiled of plots that met my criteria to be "good".
60x60 most of them with 2 exceptions. Most are also near pads, but not near ports.
here are the best places to find a 60x60:
Morning Light, has Port out Shrine, and Expert shops by other players in the area. 2g 986s
Slate hills, directly next to the pad, and feet from the port that goes to brist and others. it's the most expensive of the 60x60s though.3g 61s
*Not including the 5g player sold plot in Dikaina, but it comes with a human vault pre-built.
Just 60x60 near port:
Darvus
Dikaina
Elmnic
Scorpion's Claw
Solitaire
Fairweather *near Korth's plot who does potions like nobody's business.
*Cedar's Cove has a short run but is inexpensive at 1g 469s
Other Sizes close to pad:
70x50 Bridgehold - 1g 396s (100sqft smaller than 60x60)
70x45 Crescent - 1g 680s (near sand and well)