Sound system and Recordings to call to

Hi All: I'm doing a session at NEFFA on calling for Barn and Community Dances. The only missing piece of my information is where to get recordings. I know there are lots of folks on this list who use recordings. Would you please point me in the right direction? Also, do you have a suggestion for a small and portable sound system? I know we discussed this not that long ago. Thanks Donna Hunt