In most countries in the world Ayahuasca is legal under religious context. I would look for organizations like Sainto Daime(Saint Daime) or other organization of the kind.
A serious organization will not MAKE you pay for it. They may ask for a contribution but no more than 50 euros.
If you wish, there is the legal possibility of making a Ayahuasca analog by preparing Jurema Preta (Mimosa hostilis) with a IMAO (like syrian rue). Just do the proper research as syrian rue will make your body vunerable and requires a specific diet for about two weeks after. Failing to follow the proper diet can seriously harm your digestive system.
If you live in south america its much easier than in other continents.
I’m interested in hearing about your experience if you ever go forward with this!