Are you hiring the guy as a coach or a trainer? If not, it's none of his business what you do with your drugs or your body, but that's just me. It kinda sounds like you like to be told what to do, if that gives you a "good vibe." I would run the other direction personally, but it's your life.
As for prices, I've never gotten gear off the street, but I imagine its more expensive than the internet. Your dealer probably gets it online and resells.
That's how it very often works out. I mean there are some sources online selling 10ml of test for 30-35$ and I hear of people buying them on the street for like 100$ and up. You never know though, maybe your dealer has THE hookup and isn't too pricey.