Canvas painting stretched/mounted

Hey gang,
My boyfriend has some paintings that he bought in sri lanka a few years ago. They are on canvas and have no been stretched. We'd love to be able to hang them, we like the frame-less look. Does anyone know how much this costs to do, or can recommend a place in Park Slope that can do this? I've going into uncharted territories with this as I have no knowledge of paintings or the process. Any help is appreciated!

We just had some work done at Brooklyn Frame Works. Did a great job

http://www.brooklynframeworks.com/