On Monday, April 25, 2016 at 1:48:47 PM UTC-4, Don Y wrote:
).

Hence the appeal of cutting a PVC gutter to the ACTUAL size(s)
that I require (I'm not aware of "generic sheets of PVC material"
that I can buy locally; OTOH, I can get a gutter pretty easily!)

How many do you need? I've cut scraps out of a laundry detergent bottle for similar applications. You might have to scrounge your neighbors's recycling bins after dark if you need a lot.