While picking up some mangos for fermenting, there was a box of prickly pears
marked down cheap so grabbed 4 and it weighed out a .97lb.
Cubed them up and mixed with equal weight of dark brown sugar.
Not sure what Cho would make of cactus, but yucca is a common additive
and I use aloe vera for cloning. Some eat the paddles of this (or similar)
cactus. Worth a try...
Store bought probably aren't the best, but will keep an eye out for when the
ones here locally turn purple and might grab them for a later ferment.