Two good sources for DMT, which can be found worldwide, which is used for ayahuasca, so you don’t need to go to the amazon or contact a street dealer, are

First,
reed canary grass (Phalaris arundinacea L.), which contains DMT, MMT and 5-MeO-DMT in the whole plant. But it also contains the highly toxic alcaloid Gramin (but as we know, the dose makes the medicine), which makes this plant some kind of cautious to use.
So microdosing is advised.
From the leaves can be made an extract, which can be drunk, together with Peganum harmala, as a visionary acting Ayahuasca derivat.

Second,
common reed (Phragmites australis (Cav.) Trin. ex Steud.), which contains DMT, 5-MeO-DMT, Bufotenin and Gramin (s.a.) in its rootstock.
Also here microdosing is advised.
20 – 50 g of the rootstock cooked for minimum 15 min together with 3 g of Peganum harmala seeds, can be drunk as a visionary acting Ayahuasca derivat.