Per Adam Schefter the Bills traded a conditional 4th round pick in 2015 (potential 3rd) to the Eagles for running back Bryce Brown.
He's 6'0 220 going into his third year. He started 4 games as a rookie and one last year.
So much for drafting a running back but what doesn't Chip Kelly like about Brown that the Bills do? Any time you can trade a mid round pick for an actual NFL player I would do it. And actually I'm surprised teams don't do it more often.