If the other side is willing to hear you, just ask them for what you want. This can come in the form of favors, products, people, and anything of value. That's why barter exists in the first place - value is rarely evenly distributed. Assets are being underutilized everywhere.
To take the concept a step further, don't just ask for it. Go get it.
It's alarming to me how many people still jump through hoops just to get to precious data. Why are you going out of your way to retrieve it? Have it come to you.
Some may argue that having so many things come to you is too much of a distraction, but I see it differently. If you know you are going to need something at some time, it's like hailing a cab.