See title.
I constantly feel like any interaction with a sales person is just a big con. Whether it’s a car, insurance, an apartment, internet, or a specialty item that I’m interested in but not an expert on. I always feel completely lost and uncomfortable and like no matter what decision I make I’m making the wrong one.
Influence by Cialdini is really good and reasonably deep. Presuasion (also him) is more accessible and focused a lot more specifically on manipulative sales tactics.
If you read both of those and still want more, Nudge by Richard Thaler is pretty good as well.
Edit: one extra that’s not about in person manipulation, but how you’re manipulated before the interaction by branding: Brandwashed by Martin Lindstrom.