I had a cousin take me for $100 cash that was meant for Oxys. He'd picked up for me many times before and always came through, and sure, I shared. Of course, he was into crack heavy at the time and had recently hit that constantly-broke stage and he was fiending. I'm sure he could have got the pills, but the craving was probably just too strong. After 'I'll be back in ten' turned into over an hour, I called his cell and 'lo, he's fifty miles down the road. 'Dude, I got pulled over' Little fucker. (Grr)
Don't see the product? Don't hand over a dime. Usually, if your guy can't cover a modest amount of product then chances are higher you're getting fly-by-nighted.
Trust is earned, not handed out freely. Do not let the fact that you're craving a high affect your better judgement. Trust your intuition. It can be hard if you're green but nothing makes you learn more than getting burned that first time because you begin to realize that oftentimes, when it comes to drugs, honesty and integrity can fly out the window faster than an eight-ball in a police-chase.