This platter of papaya and melon cost only $1.49 at the Fiesta E-Mart (and included about a third more before we started munching!).
I had Googled in vain until Tamara mentioned chile-sprinkled fruit in the comments. Buying a few of these packages would be even cheaper than whole tropical fruits to cut myself.
Now for the word problems! How many 8-lb bags of navel oranges should I buy, at $5 per bag?
Each bag contains about 20 oranges, with an average of 5 cut slices per orange = 100 orange slices. Two 8-lb bags would give me plenty of insurance, with leftovers to eat at home.
So, $6 in cut fruit plus $10 in bagged oranges would leave me $4 extra to put toward some kind of savory, layered cheese torta to serve with cut bolillos.