Same thing happened to me with the monk. This dude approached me outside the dining hall and told me that they just recently translated this ancient Himalayan text and he'd give it to me for a donation. I was skeptical but also too awkward to say no, so I gave him 5 bucks (I got the impression he was going more for 20). Afterwards I realized the guy was full of shit and I don't even think he was a monk at all
but when I got back to my room I looked up the book, and I'm still not sure if it was just
recently translated to English, but apparently it's a really
important text. Like the Himalayan version of the Bible or something. Doubt I'll ever read it, but I don't regret the purchase.