Yes, Mouser.com carries such animals.
example:
3.3V for xbee
http://www.mouser.com/ProductDetail/RECOM-Power/RAC01-33SC/?qs=sGAEpiMZZMsuBfEaN9EhVc2YZ4jw9niG
5V for 'regular' logic
http://www.mouser.com/ProductDetail/RECOM-Power/RAC01-05SC/?qs=sGAEpiMZZMsuBfEaN9EhVVuZwUusrdb%2F