take out a second mortgage on your home
then purchase a large amount of a commodity, lets say you buy a large frozen block of orange juice somewhere in california
let the frozen block sit
buy a thousand grasshoppers or so (remarkably cheap from pet stores)
fence in your back yard/large area like the pterodactyl cage in jurassic park 3
call the local exterminator and figure out what pesticide and average amount is being used
administer pesticide in your pterodactyl cage to weed out the grasshoppers with weak genes
the remaining grasshoppers are biologically inclined to fight the pesticide, allow them to accumulate
steadily rise the amount of pesticide being used and repeat weeding out the weaker ones, allowing only the toughest to pass on there genes.
once they become immune to 4x or more of the average amount of pesticide being used begin to distribute 2x the average amount daily to ensure there immune systems stay strong
allow them to reproduce to an amount of biblical proportions
release grasshoppers on the larger suppliers suppliers of said commodity purchased
the grasshoppers will destroy the plantation without an exterminator phasing them
there is now a demand for orange juice
your giant frozen black of OJ is now worth a fortune