I planted my green sapote in 2018 and its about 5 feet tall now, holding onto half a dozen fruits. I got it from Plant O Gram and I believe its grafted onto mamey. Normally it doesn't look this beat up going into spring, but the drought and Santa Ana winds have been completely ludicrous this year, so most of my trees look bad. It does seem to be a hardy tree. The coldest temps it has seen were high 30's and the tree was unaffected.
I'm planning to graft scions from this tree onto some mamey rootstocks once the weather warms up, but I was hoping to get a little more than 28 bucks for it.