Awesome haul, the Japanese Sony's are cool.
This is how tape hunting is like at my thrifts the last year, it's definitely getting tougher to find good sealed tapes.
Type I = somewhat common
Type II = Might find a few in 10 to 20 trips to various thrifts
Metal = Almost as rare as hens teeth, probably find 1 every 50 to 100 trips to the thrifts