Desmanthus illinoensis is the the most powerful source of n,n-DMT
local to the Midwest. Do some research on this plant and methods of extraction. Just be aware that as the plant, you're legal. Extracted n,n-DMT is a Schedule I Controlled Substance. Read: Big trouble.
Importation os Mimosa
Hostilis Root Bark (Inner bark) is legal as well. Same legal rules apply. Good luck and say high to the Gnomes.