I've never done this myself, but I know a guy on another site who does stand-up where he lives, apparently with some success. He has said he'd have no problem using material someone else wrote, if he could afford it.
Flying blind, if this was something I wanted to do, I'd start hitting the comedy clubs where I live, becoming a regular, forming opinions on which people doing stand-up are on my wavelength in terms of what they find funny, plus which ones show promise of going beyond the local club scene.
It's easy to meet them after the show--even in New York, where I last saw stand-up in a club setting--and you could offer them some freebies on index cards then and there. On each card, a way to contact you if they're interested in more.
Worst case scenario, you never hear from them again but they use your material. No loss, since you were willing to give it away anyway.
Maryn, funny but probably not able to write actual jokes
